Bài 4: Toán tử và biểu thức, hàm toán học trong Java

**tuyettrinh_ngo269** · 03-14-2014, 07:00 AM

bài 3:
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Mã nguồn PHP:


[color=#000000]
package chuong4[/color][color=#007700]; public class [/color][color=#0000bb]baitap3 [/color][color=#007700]{    public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string [/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {        [/color][color=#0000bb]float ab [/color][color=#007700]= [/color][color=#0000bb]3f[/color][color=#007700], [/color][color=#0000bb]ac[/color][color=#007700]=[/color][color=#0000bb]4f [/color][color=#007700], [/color][color=#0000bb]bc[/color][color=#007700]=[/color][color=#0000bb]5f [/color][color=#007700], [/color][color=#0000bb]s[/color][color=#007700], [/color][color=#0000bb]p[/color][color=#007700];        [/color][color=#0000bb]double sin_a[/color][color=#007700],[/color][color=#0000bb]sin_b[/color][color=#007700],[/color][color=#0000bb]sin_c[/color][color=#007700];        [/color][color=#0000bb]p[/color][color=#007700]=([/color][color=#0000bb]ab[/color][color=#007700]+[/color][color=#0000bb]bc[/color][color=#007700]+[/color][color=#0000bb]ac[/color][color=#007700])/[/color][color=#0000bb]2[/color][color=#007700];        [/color][color=#0000bb]s[/color][color=#007700]=(float)[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]sqrt[/color][color=#007700]([/color][color=#0000bb]p[/color][color=#007700]*([/color][color=#0000bb]p[/color][color=#007700]-[/color][color=#0000bb]ab[/color][color=#007700])*([/color][color=#0000bb]p[/color][color=#007700]-[/color][color=#0000bb]ac[/color][color=#007700])*([/color][color=#0000bb]p[/color][color=#007700]-[/color][color=#0000bb]bc[/color][color=#007700]));        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"diện tích = " [/color][color=#007700]+[/color][color=#0000bb]s[/color][color=#007700]);               [/color][color=#0000bb]sin_a [/color][color=#007700]= (float) (([/color][color=#0000bb]2[/color][color=#007700]*[/color][color=#0000bb]s[/color][color=#007700])/([/color][color=#0000bb]ab[/color][color=#007700]*[/color][color=#0000bb]ac[/color][color=#007700]));        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"góc a = " [/color][color=#007700]+[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]todegrees[/color][color=#007700]([/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]asin[/color][color=#007700]([/color][color=#0000bb]sin_a[/color][color=#007700])));        [/color][color=#0000bb]sin_b [/color][color=#007700]= (float) (([/color][color=#0000bb]2[/color][color=#007700]*[/color][color=#0000bb]s[/color][color=#007700])/([/color][color=#0000bb]ab[/color][color=#007700]*[/color][color=#0000bb]bc[/color][color=#007700]));        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"góc b = " [/color][color=#007700]+[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]todegrees[/color][color=#007700]([/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]asin[/color][color=#007700]([/color][color=#0000bb]sin_b[/color][color=#007700])));        [/color][color=#0000bb]sin_c [/color][color=#007700]= (float) (([/color][color=#0000bb]2[/color][color=#007700]*[/color][color=#0000bb]s[/color][color=#007700])/([/color][color=#0000bb]bc[/color][color=#007700]*[/color][color=#0000bb]ac[/color][color=#007700]));        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"góc c = " [/color][color=#007700]+[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]todegrees[/color][color=#007700]([/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]asin[/color][color=#007700]([/color][color=#0000bb]sin_c[/color][color=#007700])));           }   }[/color]

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**lamtolinh** · 03-21-2014, 07:00 AM

chào các bạn, mình là mem mới, dưới đây là bt của mình.
bt01

Mã:

public class para01 {
    public static void main(string[] args) {
        int a = 621;
        int b = 634;
        int c = 111;
        system.out.println("a=" + a + "\tb=" + b + "\tc=" + c);
        system.out.println("phan nguyen khi chia a,b,c cho 2:
a: " + (a/2) + "\tb=" + (b/2) + "\tc=" + (c/2));
        system.out.println("phan dd khi chia a,b,c cho 3:
a: " + (a%3) + "\tb=" + (b%3) + "\tc=" + (c%3));     
        system.out.println("tang khi c a,b,c them 1
a: " + (++a) + "\tb=" + (++b) + "\tc=" + (++c));
    }
}

bt02

Mã:

public class para02 {
   
    public static void main(string[] args) {
        float a = 4f, b = 8f, c = 10f, x;
        system.out.println("giai phuong trinh bac nhat : 2ax + b = 8c");
        system.out.print("voi a = 4, b = 8, c = 10. x?");
        float res = (8*c - b)/(2*a);
        res = (int) res;
        system.out.print("
x = " + res);
    }
}

bt03

Mã:

public class para03 {
    public static void main(string[] args) {
        double a = 12f, b = 8f, c = 7f;
        double a, b, c;
        system.out.println("do dai 3 canh tam giac: a=" + a + "\tb=" + b + "\tc=" + c);
        a = math.acos((b*b+c*c - a*a)/(2*b*c));
        b = math.acos((a*a+c*c - b*b)/(2*a*c));
        c = math.acos((a*a+b*b - c*c)/(2*a*b));
        system.out.println("so do 3 goc tam giac: a=" + math.todegrees(a) + "\tb=" + math.todegrees(b) + "\tc=" + math.todegrees(c));
    }
}

**huyenhcit123** · 03-21-2014, 07:00 AM

chào các bạn, mình là mem mới, dưới đây là bt của mình.
bt01

Mã nguồn PHP:


[color=#000000]
[/color][color=#007700]public class [/color][color=#0000bb]para01 [/color][color=#007700]{    public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {        [/color][color=#0000bb]int a [/color][color=#007700]= [/color][color=#0000bb]621[/color][color=#007700];        [/color][color=#0000bb]int b [/color][color=#007700]= [/color][color=#0000bb]634[/color][color=#007700];        [/color][color=#0000bb]int c [/color][color=#007700]= [/color][color=#0000bb]111[/color][color=#007700];        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"a=" [/color][color=#007700]+ [/color][color=#0000bb]a [/color][color=#007700]+ [/color][color=#dd0000]"\tb=" [/color][color=#007700]+ [/color][color=#0000bb]b [/color][color=#007700]+ [/color][color=#dd0000]"\tc=" [/color][color=#007700]+ [/color][color=#0000bb]c[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phan nguyen khi chia a,b,c cho 2:
a: " [/color][color=#007700]+ ([/color][color=#0000bb]a[/color][color=#007700]/[/color][color=#0000bb]2[/color][color=#007700]) + [/color][color=#dd0000]"\tb=" [/color][color=#007700]+ ([/color][color=#0000bb]b[/color][color=#007700]/[/color][color=#0000bb]2[/color][color=#007700]) + [/color][color=#dd0000]"\tc=" [/color][color=#007700]+ ([/color][color=#0000bb]c[/color][color=#007700]/[/color][color=#0000bb]2[/color][color=#007700]));        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phan dd khi chia a,b,c cho 3:
a: " [/color][color=#007700]+ ([/color][color=#0000bb]a[/color][color=#007700]%[/color][color=#0000bb]3[/color][color=#007700]) + [/color][color=#dd0000]"\tb=" [/color][color=#007700]+ ([/color][color=#0000bb]b[/color][color=#007700]%[/color][color=#0000bb]3[/color][color=#007700]) + [/color][color=#dd0000]"\tc=" [/color][color=#007700]+ ([/color][color=#0000bb]c[/color][color=#007700]%[/color][color=#0000bb]3[/color][color=#007700]));           [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"tang khi c a,b,c them 1
a: " [/color][color=#007700]+ (++[/color][color=#0000bb]a[/color][color=#007700]) + [/color][color=#dd0000]"\tb=" [/color][color=#007700]+ (++[/color][color=#0000bb]b[/color][color=#007700]) + [/color][color=#dd0000]"\tc=" [/color][color=#007700]+ (++[/color][color=#0000bb]c[/color][color=#007700]));    }}[/color]

bt02

Mã nguồn PHP:


[color=#000000]
[/color][color=#007700]public class [/color][color=#0000bb]para02 [/color][color=#007700]{     public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {        [/color][color=#0000bb]float a [/color][color=#007700]= [/color][color=#0000bb]4f[/color][color=#007700], [/color][color=#0000bb]b [/color][color=#007700]= [/color][color=#0000bb]8f[/color][color=#007700], [/color][color=#0000bb]c [/color][color=#007700]= [/color][color=#0000bb]10f[/color][color=#007700], [/color][color=#0000bb]x[/color][color=#007700];        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"giai phuong trinh bac nhat : 2ax + b = 8c"[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"voi a = 4, b = 8, c = 10. x?"[/color][color=#007700]);        [/color][color=#0000bb]float res [/color][color=#007700]= ([/color][color=#0000bb]8[/color][color=#007700]*[/color][color=#0000bb]c [/color][color=#007700]- [/color][color=#0000bb]b[/color][color=#007700])/([/color][color=#0000bb]2[/color][color=#007700]*[/color][color=#0000bb]a[/color][color=#007700]);        [/color][color=#0000bb]res [/color][color=#007700]= (int) [/color][color=#0000bb]res[/color][color=#007700];        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"
x = " [/color][color=#007700]+ [/color][color=#0000bb]res[/color][color=#007700]);    }}[/color]

bt03

Mã:

public class para03 {
    public static void main(string[] args) {
        double a = 12f, b = 8f, c = 7f;
        double a, b, c;
        system.out.println("do dai 3 canh tam giac: a=" + a + "\tb=" + b + "\tc=" + c);
        a = math.acos((b*b+c*c - a*a)/(2*b*c));
        b = math.acos((a*a+c*c - b*b)/(2*a*c));
        c = math.acos((a*a+b*b - c*c)/(2*a*b));
        system.out.println("so do 3 goc tam giac: a=" + math.todegrees(a) + "\tb=" + math.todegrees(b) + "\tc=" + math.todegrees(c));
    }
}

**huutuan2015** · 03-28-2014, 07:00 AM

nộp bài đây các bạn chỉ giáo dùm nhé
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Mã nguồn PHP:


[color=#000000]
[/color][color=#ff8000]/** to change this license header, choose license headers in project properties.* to change this template file, choose tools | templates* and open the template in the editor.*/ [/color][color=#0000bb]package bai04_bt1[/color][color=#007700];[/color][color=#ff8000]//bài 1: các biến a, b, c là các số nguyên. gán giá trị cho các biến.//tìm phần nguyên khi chia các số này cho 2, tìm phần dư khi chia các//số này cho 3, in kết quả ra màn hình. tăng giá trị a, b, c mỗi biến// lên 1, in giá trị 3 số ra màn hình/**** @author administrator*/[/color][color=#007700]public class [/color][color=#0000bb]bt1 [/color][color=#007700]{     [/color][color=#ff8000]/**    * @param args the command line arguments    */    [/color][color=#007700]public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {        [/color][color=#ff8000]// todo code application logic here        [/color][color=#0000bb]short a[/color][color=#007700],[/color][color=#0000bb]b[/color][color=#007700],[/color][color=#0000bb]c[/color][color=#007700];        [/color][color=#ff8000]// gán giá trị cho các biến        [/color][color=#0000bb]a[/color][color=#007700]=[/color][color=#0000bb]20[/color][color=#007700]; [/color][color=#0000bb]b[/color][color=#007700]=[/color][color=#0000bb]21[/color][color=#007700]; [/color][color=#0000bb]c[/color][color=#007700]=[/color][color=#0000bb]22[/color][color=#007700];        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"giá trị các biến a,b,c: "[/color][color=#007700]+[/color][color=#0000bb]a[/color][color=#007700]+[/color][color=#dd0000]", "[/color][color=#007700]+[/color][color=#0000bb]b[/color][color=#007700]+[/color][color=#dd0000]", "[/color][color=#007700]+[/color][color=#0000bb]c[/color][color=#007700]);        [/color][color=#ff8000]// tìm phần nguyên khi chia các số cho 2        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phần nguyên khi chia biến a cho 2: " [/color][color=#007700]+ [/color][color=#0000bb]a[/color][color=#007700]/[/color][color=#0000bb]2[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phần nguyên khi chia biến b cho 2: " [/color][color=#007700]+ [/color][color=#0000bb]b[/color][color=#007700]/[/color][color=#0000bb]2[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phần nguyên khi chia biến c cho 2: " [/color][color=#007700]+ [/color][color=#0000bb]c[/color][color=#007700]/[/color][color=#0000bb]2[/color][color=#007700]);        [/color][color=#ff8000]// tìm phần dư khi chia các số này cho 3        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phần dư khi chia biến a cho 3: " [/color][color=#007700]+ [/color][color=#0000bb]a[/color][color=#007700]%[/color][color=#0000bb]3[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phần dư khi chia biến b cho 3: " [/color][color=#007700]+ [/color][color=#0000bb]b[/color][color=#007700]%[/color][color=#0000bb]3[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phần dư khi chia biến c cho 3: " [/color][color=#007700]+ [/color][color=#0000bb]c[/color][color=#007700]%[/color][color=#0000bb]3[/color][color=#007700]);        [/color][color=#ff8000]// tăng giá trị các biến lên 1 và in ra màn hình        [/color][color=#0000bb]a[/color][color=#007700]++; [/color][color=#0000bb]b[/color][color=#007700]++; [/color][color=#0000bb]c[/color][color=#007700]++;        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"a= "[/color][color=#007700]+[/color][color=#0000bb]a[/color][color=#007700]+[/color][color=#dd0000]" b= "[/color][color=#007700]+[/color][color=#0000bb]b[/color][color=#007700]+[/color][color=#dd0000]" c= "[/color][color=#007700]+[/color][color=#0000bb]c[/color][color=#007700]);    }   }[/color]

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Mã nguồn PHP:


[color=#000000]
[/color][color=#ff8000]/** to change this license header, choose license headers in project properties.* to change this template file, choose tools | templates* and open the template in the editor.*///bài 2: giải phương trình 2ax+b = 8c với a, b, c là số thực – được//gán giá trị trong chương trình, x cũng là số thực, là giá trị cần//tìm. sau khi tính x in kết quả ra màn hình, ép kiểu x về số nguyên,//in kết quả ép kiểu của x ra màn hình![/color][color=#0000bb]package bai04_bt2[/color][color=#007700];[/color][color=#ff8000]/**** @author administrator*/[/color][color=#007700]public class [/color][color=#0000bb]bt2 [/color][color=#007700]{    public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {        [/color][color=#ff8000]// code giải phương trình 2ax+b=8c        [/color][color=#0000bb]float a[/color][color=#007700],[/color][color=#0000bb]b[/color][color=#007700],[/color][color=#0000bb]c[/color][color=#007700]; [/color][color=#ff8000]// khai báo các biến thực a,b,c        [/color][color=#0000bb]float x[/color][color=#007700]; [/color][color=#ff8000]// khai báo biến x        // gán giá trị cho a,b,c        [/color][color=#0000bb]a[/color][color=#007700]=[/color][color=#0000bb]10[/color][color=#007700]; [/color][color=#0000bb]b[/color][color=#007700]=[/color][color=#0000bb]20[/color][color=#007700]; [/color][color=#0000bb]c[/color][color=#007700]=[/color][color=#0000bb]30[/color][color=#007700];        [/color][color=#ff8000]// tính x        [/color][color=#0000bb]x[/color][color=#007700]=([/color][color=#0000bb]8[/color][color=#007700]*[/color][color=#0000bb]c[/color][color=#007700]-[/color][color=#0000bb]b[/color][color=#007700])/([/color][color=#0000bb]2[/color][color=#007700]*[/color][color=#0000bb]a[/color][color=#007700]);        [/color][color=#ff8000]// xuất giá trị x ra màn hình        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"a=" [/color][color=#007700]+[/color][color=#0000bb]a[/color][color=#007700]+ [/color][color=#dd0000]",b=" [/color][color=#007700]+[/color][color=#0000bb]b[/color][color=#007700]+ [/color][color=#dd0000]",c=" [/color][color=#007700]+[/color][color=#0000bb]c[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"giá trị x="[/color][color=#007700]+[/color][color=#0000bb]x[/color][color=#007700]);        [/color][color=#ff8000]// khai báo biến xnguyen        [/color][color=#0000bb]short xnguyen[/color][color=#007700];        [/color][color=#0000bb]xnguyen[/color][color=#007700]=([/color][color=#0000bb]short[/color][color=#007700])[/color][color=#0000bb]x[/color][color=#007700];        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#0000bb]xnguyen[/color][color=#007700]);        }}[/color]

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Mã nguồn PHP:


[color=#000000]
[/color][color=#ff8000]/** to change this license header, choose license headers in project properties.* to change this template file, choose tools | templates* and open the template in the editor.*///bài 3: cho a, b, c là độ dài 3 cạnh tam giác, a, b, c được gán//giá trị trong chương trình. viết chương trình tính diện tích s//của tam giác, in kết quả ra màn hình. tìm số đo 3 góc của tam//giác đó, in kết quả ra màn hình.[/color][color=#0000bb]package bai04_bt3[/color][color=#007700]; [/color][color=#ff8000]/**** @author administrator*/[/color][color=#007700]public class [/color][color=#0000bb]bt3 [/color][color=#007700]{    public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]){        [/color][color=#ff8000]//khai báo biến abc chứa 3 canh tam giác        [/color][color=#0000bb]float a[/color][color=#007700],[/color][color=#0000bb]b[/color][color=#007700],[/color][color=#0000bb]c[/color][color=#007700];        [/color][color=#0000bb]float s[/color][color=#007700],[/color][color=#0000bb]p[/color][color=#007700];        [/color][color=#ff8000]//gán giá trị các biến        [/color][color=#0000bb]a[/color][color=#007700]=[/color][color=#0000bb]3.5f[/color][color=#007700]; [/color][color=#0000bb]b[/color][color=#007700]=[/color][color=#0000bb]2.6f[/color][color=#007700]; [/color][color=#0000bb]c[/color][color=#007700]=[/color][color=#0000bb]3.8f[/color][color=#007700];        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"a= "[/color][color=#007700]+[/color][color=#0000bb]a[/color][color=#007700]+[/color][color=#dd0000]", b= "[/color][color=#007700]+[/color][color=#0000bb]b[/color][color=#007700]+[/color][color=#dd0000]" c= "[/color][color=#007700]+[/color][color=#0000bb]c[/color][color=#007700]);        [/color][color=#ff8000]//tính diện tích bằng công thức hê rông        [/color][color=#0000bb]p[/color][color=#007700]=([/color][color=#0000bb]a[/color][color=#007700]+[/color][color=#0000bb]b[/color][color=#007700]+[/color][color=#0000bb]c[/color][color=#007700])/[/color][color=#0000bb]2[/color][color=#007700];        [/color][color=#0000bb]s[/color][color=#007700]=(float) [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]sqrt[/color][color=#007700]([/color][color=#0000bb]p[/color][color=#007700]*([/color][color=#0000bb]p[/color][color=#007700]-[/color][color=#0000bb]a[/color][color=#007700])*([/color][color=#0000bb]p[/color][color=#007700]-[/color][color=#0000bb]b[/color][color=#007700])*([/color][color=#0000bb]p[/color][color=#007700]-[/color][color=#0000bb]c[/color][color=#007700]));        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"diện tích s= "[/color][color=#007700]+[/color][color=#0000bb]s[/color][color=#007700]);        [/color][color=#ff8000]// tính các góc        [/color][color=#0000bb]float alpha[/color][color=#007700],[/color][color=#0000bb]beta[/color][color=#007700],[/color][color=#0000bb]gamma[/color][color=#007700];        [/color][color=#0000bb]alpha[/color][color=#007700]=(float) [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]acos[/color][color=#007700](([/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]pow[/color][color=#007700]([/color][color=#0000bb]b[/color][color=#007700],[/color][color=#0000bb]2[/color][color=#007700])+[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]pow[/color][color=#007700]([/color][color=#0000bb]c[/color][color=#007700],[/color][color=#0000bb]2[/color][color=#007700])-[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]pow[/color][color=#007700]([/color][color=#0000bb]a[/color][color=#007700],[/color][color=#0000bb]2[/color][color=#007700]))/([/color][color=#0000bb]2[/color][color=#007700]*[/color][color=#0000bb]b[/color][color=#007700]*[/color][color=#0000bb]c[/color][color=#007700]));        [/color][color=#0000bb]beta[/color][color=#007700]=(float) [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]acos[/color][color=#007700](([/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]pow[/color][color=#007700]([/color][color=#0000bb]a[/color][color=#007700],[/color][color=#0000bb]2[/color][color=#007700])+[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]pow[/color][color=#007700]([/color][color=#0000bb]c[/color][color=#007700],[/color][color=#0000bb]2[/color][color=#007700])-[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]pow[/color][color=#007700]([/color][color=#0000bb]b[/color][color=#007700],[/color][color=#0000bb]2[/color][color=#007700]))/([/color][color=#0000bb]2[/color][color=#007700]*[/color][color=#0000bb]a[/color][color=#007700]*[/color][color=#0000bb]c[/color][color=#007700]));        [/color][color=#0000bb]gamma[/color][color=#007700]=(float) [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]acos[/color][color=#007700](([/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]pow[/color][color=#007700]([/color][color=#0000bb]a[/color][color=#007700],[/color][color=#0000bb]2[/color][color=#007700])+[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]pow[/color][color=#007700]([/color][color=#0000bb]b[/color][color=#007700],[/color][color=#0000bb]2[/color][color=#007700])-[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]pow[/color][color=#007700]([/color][color=#0000bb]c[/color][color=#007700],[/color][color=#0000bb]2[/color][color=#007700]))/([/color][color=#0000bb]2[/color][color=#007700]*[/color][color=#0000bb]a[/color][color=#007700]*[/color][color=#0000bb]b[/color][color=#007700]));        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"các góc:"[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"α="[/color][color=#007700]+[/color][color=#0000bb]alpha[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"β="[/color][color=#007700]+[/color][color=#0000bb]beta[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"γ="[/color][color=#007700]+[/color][color=#0000bb]gamma[/color][color=#007700]);    }}[/color]

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**123muacanho** · 04-07-2014, 07:00 AM

bai 3:

Mã nguồn PHP:


[color=#000000]
[/color][color=#007700]public class [/color][color=#0000bb]baitap3 [/color][color=#007700]{    public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {        [/color][color=#0000bb]double a[/color][color=#007700], [/color][color=#0000bb]b[/color][color=#007700], [/color][color=#0000bb]c[/color][color=#007700], [/color][color=#0000bb]a[/color][color=#007700], [/color][color=#0000bb]b[/color][color=#007700], [/color][color=#0000bb]c[/color][color=#007700],[/color][color=#0000bb]_cosa[/color][color=#007700], [/color][color=#0000bb]_cosb[/color][color=#007700], [/color][color=#0000bb]_cosc[/color][color=#007700], [/color][color=#0000bb]dientich[/color][color=#007700], [/color][color=#0000bb]h[/color][color=#007700];        [/color][color=#0000bb]a[/color][color=#007700]= [/color][color=#0000bb]6[/color][color=#007700]; [/color][color=#0000bb]b[/color][color=#007700]=[/color][color=#0000bb]5[/color][color=#007700]; [/color][color=#0000bb]c[/color][color=#007700]=[/color][color=#0000bb]7[/color][color=#007700];        [/color][color=#0000bb]_cosc[/color][color=#007700]=([/color][color=#0000bb]a[/color][color=#007700]*[/color][color=#0000bb]a[/color][color=#007700]+[/color][color=#0000bb]b[/color][color=#007700]*[/color][color=#0000bb]b[/color][color=#007700]-[/color][color=#0000bb]c[/color][color=#007700]*[/color][color=#0000bb]c[/color][color=#007700])/([/color][color=#0000bb]2[/color][color=#007700]*[/color][color=#0000bb]a[/color][color=#007700]*[/color][color=#0000bb]b[/color][color=#007700]);        [/color][color=#0000bb]_cosb[/color][color=#007700]=([/color][color=#0000bb]a[/color][color=#007700]*[/color][color=#0000bb]a[/color][color=#007700]-[/color][color=#0000bb]b[/color][color=#007700]*[/color][color=#0000bb]b[/color][color=#007700]+[/color][color=#0000bb]c[/color][color=#007700]*[/color][color=#0000bb]c[/color][color=#007700])/([/color][color=#0000bb]2[/color][color=#007700]*[/color][color=#0000bb]c[/color][color=#007700]*[/color][color=#0000bb]a[/color][color=#007700]);        [/color][color=#0000bb]_cosa[/color][color=#007700]=(-[/color][color=#0000bb]a[/color][color=#007700]*[/color][color=#0000bb]a[/color][color=#007700]+[/color][color=#0000bb]b[/color][color=#007700]*[/color][color=#0000bb]b[/color][color=#007700]+[/color][color=#0000bb]c[/color][color=#007700]*[/color][color=#0000bb]c[/color][color=#007700])/([/color][color=#0000bb]2[/color][color=#007700]*[/color][color=#0000bb]c[/color][color=#007700]*[/color][color=#0000bb]b[/color][color=#007700]);        [/color][color=#0000bb]c[/color][color=#007700]=[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]acos[/color][color=#007700]([/color][color=#0000bb]_cosc[/color][color=#007700]);        [/color][color=#0000bb]b[/color][color=#007700]=[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]acos[/color][color=#007700]([/color][color=#0000bb]_cosb[/color][color=#007700]);        [/color][color=#0000bb]a[/color][color=#007700]=[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]acos[/color][color=#007700]([/color][color=#0000bb]_cosa[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"góc a là : "[/color][color=#007700]+[/color][color=#0000bb]a[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"góc b là : "[/color][color=#007700]+[/color][color=#0000bb]b[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"góc c là : "[/color][color=#007700]+[/color][color=#0000bb]c[/color][color=#007700]);        [/color][color=#0000bb]h[/color][color=#007700]=[/color][color=#0000bb]a[/color][color=#007700]*[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]sin[/color][color=#007700]([/color][color=#0000bb]c[/color][color=#007700]);[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"chiều cao của tam giác ứng với cạnh đáy c: "[/color][color=#007700]+[/color][color=#0000bb]h[/color][color=#007700]);        [/color][color=#0000bb]dientich[/color][color=#007700]= ([/color][color=#0000bb]h[/color][color=#007700]/[/color][color=#0000bb]2[/color][color=#007700])*[/color][color=#0000bb]c[/color][color=#007700];        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"diện tích của tam giác: "[/color][color=#007700]+[/color][color=#0000bb]dientich[/color][color=#007700]);       }}[/color]

**incomviet** · 04-22-2014, 07:00 AM

mình nộp bài

bài 1: các biến a, b, c là các số nguyên. gán giá trị cho các biến. tìm phần nguyên khi chia các số này cho 2, tìm phần dư khi chia các số này cho 3, in kết quả ra màn hình. tăng giá trị a, b, c mỗi biến lên 1, in giá trị 3 số ra màn hình.

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Mã nguồn PHP:


[color=#000000]
[/color][color=#007700]public class [/color][color=#0000bb]learnjava [/color][color=#007700]{    [/color][color=#ff8000]/**    * @param args the command line arguments    */    [/color][color=#007700]public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {        [/color][color=#0000bb]int a[/color][color=#007700], [/color][color=#0000bb]b[/color][color=#007700], [/color][color=#0000bb]c[/color][color=#007700];        [/color][color=#0000bb]int nguyen_a[/color][color=#007700], [/color][color=#0000bb]nguyen_b[/color][color=#007700], [/color][color=#0000bb]nguyen_c[/color][color=#007700];        [/color][color=#0000bb]int du_a[/color][color=#007700], [/color][color=#0000bb]du_b[/color][color=#007700], [/color][color=#0000bb]du_c[/color][color=#007700];        [/color][color=#0000bb]a [/color][color=#007700]= [/color][color=#0000bb]5[/color][color=#007700];        [/color][color=#0000bb]b [/color][color=#007700]= [/color][color=#0000bb]9[/color][color=#007700];        [/color][color=#0000bb]c [/color][color=#007700]= [/color][color=#0000bb]18[/color][color=#007700];        [/color][color=#ff8000]// phan nguyen        [/color][color=#0000bb]nguyen_a [/color][color=#007700]= [/color][color=#0000bb]a [/color][color=#007700]/ [/color][color=#0000bb]2[/color][color=#007700];        [/color][color=#0000bb]nguyen_b [/color][color=#007700]= [/color][color=#0000bb]b [/color][color=#007700]/ [/color][color=#0000bb]2[/color][color=#007700];        [/color][color=#0000bb]nguyen_c [/color][color=#007700]= [/color][color=#0000bb]c [/color][color=#007700]/ [/color][color=#0000bb]2[/color][color=#007700];        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phan nguyen cua " [/color][color=#007700]+ [/color][color=#0000bb]a [/color][color=#007700]+ [/color][color=#dd0000]" khi chia cho 2 = " [/color][color=#007700]+ [/color][color=#0000bb]nguyen_a[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phan nguyen cua " [/color][color=#007700]+ [/color][color=#0000bb]b [/color][color=#007700]+ [/color][color=#dd0000]" khi chia cho 2 = " [/color][color=#007700]+ [/color][color=#0000bb]nguyen_b[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phan nguyen cua " [/color][color=#007700]+ [/color][color=#0000bb]c [/color][color=#007700]+ [/color][color=#dd0000]" khi chia cho 2 = " [/color][color=#007700]+ [/color][color=#0000bb]nguyen_c[/color][color=#007700]);             [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]""[/color][color=#007700]);             [/color][color=#ff8000]// phan du        [/color][color=#0000bb]du_a [/color][color=#007700]= [/color][color=#0000bb]a [/color][color=#007700]% [/color][color=#0000bb]2[/color][color=#007700];        [/color][color=#0000bb]du_b [/color][color=#007700]= [/color][color=#0000bb]b [/color][color=#007700]% [/color][color=#0000bb]2[/color][color=#007700];        [/color][color=#0000bb]du_c [/color][color=#007700]= [/color][color=#0000bb]c [/color][color=#007700]% [/color][color=#0000bb]2[/color][color=#007700];        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phan du cua " [/color][color=#007700]+ [/color][color=#0000bb]a [/color][color=#007700]+ [/color][color=#dd0000]" khi chia cho 2 = " [/color][color=#007700]+ [/color][color=#0000bb]du_a[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phan du cua " [/color][color=#007700]+ [/color][color=#0000bb]b [/color][color=#007700]+ [/color][color=#dd0000]" khi chia cho 2 = " [/color][color=#007700]+ [/color][color=#0000bb]du_b[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phan du cua " [/color][color=#007700]+ [/color][color=#0000bb]c [/color][color=#007700]+ [/color][color=#dd0000]" khi chia cho 2 = " [/color][color=#007700]+ [/color][color=#0000bb]du_c[/color][color=#007700]);             [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]""[/color][color=#007700]);             [/color][color=#ff8000]// tang gia tri a, b, c        [/color][color=#0000bb]a[/color][color=#007700]++; [/color][color=#0000bb]b[/color][color=#007700]++; [/color][color=#0000bb]c[/color][color=#007700]++;        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"gia tri moi cua a = " [/color][color=#007700]+ [/color][color=#0000bb]a[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"gia tri moi cua b = " [/color][color=#007700]+ [/color][color=#0000bb]b[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"gia tri moi cua c = " [/color][color=#007700]+ [/color][color=#0000bb]c[/color][color=#007700]);    }}[/color]

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bài 2: giải phương trình 2ax+b = 8c với a, b, c là số thực – được gán giá trị trong chương trình, x cũng là số thực, là giá trị cần tìm. sau khi tính x in kết quả ra màn hình, ép kiểu x về số nguyên, in kết quả ép kiểu của x ra màn hình!
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Mã nguồn PHP:


[color=#000000]
[/color][color=#007700]public class [/color][color=#0000bb]learnjava [/color][color=#007700]{     [/color][color=#ff8000]/**    * @param args the command line arguments    */    [/color][color=#007700]public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {        [/color][color=#0000bb]float a[/color][color=#007700], [/color][color=#0000bb]b[/color][color=#007700], [/color][color=#0000bb]c[/color][color=#007700], [/color][color=#0000bb]x[/color][color=#007700];        [/color][color=#0000bb]a [/color][color=#007700]= [/color][color=#0000bb]4.3f[/color][color=#007700];        [/color][color=#0000bb]b [/color][color=#007700]= [/color][color=#0000bb]2.5f[/color][color=#007700];        [/color][color=#0000bb]c [/color][color=#007700]= [/color][color=#0000bb]8f[/color][color=#007700];         [/color][color=#ff8000]// tim gia tri x        [/color][color=#0000bb]x [/color][color=#007700]= (([/color][color=#0000bb]8 [/color][color=#007700]* [/color][color=#0000bb]c[/color][color=#007700]) - [/color][color=#0000bb]b[/color][color=#007700]) / ([/color][color=#0000bb]2 [/color][color=#007700]* [/color][color=#0000bb]a[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"gia tri cua x can tim la: " [/color][color=#007700]+ [/color][color=#0000bb]x[/color][color=#007700]);        [/color][color=#ff8000]// ep kieu        [/color][color=#0000bb]int new_x [/color][color=#007700]= (int) [/color][color=#0000bb]x[/color][color=#007700];        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"gia tri cua x sau khi ep kieu la: " [/color][color=#007700]+ [/color][color=#0000bb]new_x[/color][color=#007700]);    }}[/color]

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bài 3: cho a, b, c là độ dài 3 cạnh tam giác, a, b, c được gán giá trị trong chương trình. viết chương trình tính diện tích s của tam giác, in kết quả ra màn hình. tìm số đo 3 góc của tam giác đó, in kết quả ra màn hình.

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Mã nguồn PHP:


[color=#000000]
[/color][color=#007700]public class [/color][color=#0000bb]learnjava [/color][color=#007700]{     [/color][color=#ff8000]/**    * @param args the command line arguments    */    [/color][color=#007700]public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {        [/color][color=#0000bb]double a[/color][color=#007700], [/color][color=#0000bb]b[/color][color=#007700], [/color][color=#0000bb]c[/color][color=#007700];        [/color][color=#0000bb]double p[/color][color=#007700], [/color][color=#0000bb]s[/color][color=#007700];        [/color][color=#0000bb]double goc_a[/color][color=#007700], [/color][color=#0000bb]goc_b[/color][color=#007700], [/color][color=#0000bb]goc_c[/color][color=#007700];             [/color][color=#0000bb]a [/color][color=#007700]= [/color][color=#0000bb]5[/color][color=#007700];        [/color][color=#0000bb]b [/color][color=#007700]= [/color][color=#0000bb]6[/color][color=#007700];        [/color][color=#0000bb]c [/color][color=#007700]= [/color][color=#0000bb]7[/color][color=#007700];         [/color][color=#ff8000]// tinh nua chu vi p        [/color][color=#0000bb]p [/color][color=#007700]= ([/color][color=#0000bb]a [/color][color=#007700]+ [/color][color=#0000bb]b [/color][color=#007700]+ [/color][color=#0000bb]c[/color][color=#007700]) / [/color][color=#0000bb]2[/color][color=#007700];         [/color][color=#ff8000]// tinh dien tich s        [/color][color=#0000bb]s [/color][color=#007700]= [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]sqrt[/color][color=#007700]([/color][color=#0000bb]p [/color][color=#007700]* ([/color][color=#0000bb]p [/color][color=#007700]- [/color][color=#0000bb]a[/color][color=#007700]) * ([/color][color=#0000bb]p [/color][color=#007700]- [/color][color=#0000bb]b[/color][color=#007700]) * ([/color][color=#0000bb]p [/color][color=#007700]- [/color][color=#0000bb]c[/color][color=#007700]));        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"dien tich s = " [/color][color=#007700]+ [/color][color=#0000bb]s[/color][color=#007700]);             [/color][color=#ff8000]// tinh goc su dung dung ly cos        [/color][color=#0000bb]goc_a [/color][color=#007700]= [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]acos[/color][color=#007700](([/color][color=#0000bb]b [/color][color=#007700]* [/color][color=#0000bb]b [/color][color=#007700]+ [/color][color=#0000bb]c [/color][color=#007700]* [/color][color=#0000bb]c [/color][color=#007700]- [/color][color=#0000bb]a [/color][color=#007700]* [/color][color=#0000bb]a[/color][color=#007700]) / ([/color][color=#0000bb]2 [/color][color=#007700]* [/color][color=#0000bb]b [/color][color=#007700]* [/color][color=#0000bb]c[/color][color=#007700]));        [/color][color=#0000bb]goc_b [/color][color=#007700]= [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]acos[/color][color=#007700](([/color][color=#0000bb]a [/color][color=#007700]* [/color][color=#0000bb]a [/color][color=#007700]+ [/color][color=#0000bb]c [/color][color=#007700]* [/color][color=#0000bb]c [/color][color=#007700]- [/color][color=#0000bb]b [/color][color=#007700]* [/color][color=#0000bb]b[/color][color=#007700]) / ([/color][color=#0000bb]2 [/color][color=#007700]* [/color][color=#0000bb]a [/color][color=#007700]* [/color][color=#0000bb]c[/color][color=#007700]));        [/color][color=#0000bb]goc_c [/color][color=#007700]= [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]acos[/color][color=#007700](([/color][color=#0000bb]a [/color][color=#007700]* [/color][color=#0000bb]a [/color][color=#007700]+ [/color][color=#0000bb]b [/color][color=#007700]* [/color][color=#0000bb]b [/color][color=#007700]- [/color][color=#0000bb]c [/color][color=#007700]* [/color][color=#0000bb]c[/color][color=#007700]) / ([/color][color=#0000bb]2 [/color][color=#007700]* [/color][color=#0000bb]a [/color][color=#007700]* [/color][color=#0000bb]b[/color][color=#007700]));             [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"so do goc a = " [/color][color=#007700]+ [/color][color=#0000bb]goc_a [/color][color=#007700]+ [/color][color=#dd0000]" rad"[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"so do goc b = " [/color][color=#007700]+ [/color][color=#0000bb]goc_b [/color][color=#007700]+ [/color][color=#dd0000]" rad"[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"so do goc c = " [/color][color=#007700]+ [/color][color=#0000bb]goc_c [/color][color=#007700]+ [/color][color=#dd0000]" rad"[/color][color=#007700]);    }}[/color]

</blockquote></div>
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**qerferf** · 04-22-2014, 07:00 AM

public class demo {
public static void main (string[] args){
int a=2, b=12, c =11;
// bai 1
system.out.println("phan nguyen:a: "+a/2+" b: "+b/2+" +c: "+c/2);
system.out.println("phan du a: "+a%3+" b: "+b%3+" +c: "+c%3);
a++; b++; c++;
system.out.println("tag len 1 don vi a: "+ a +" b: "+b +" +c: "+c);
// bai 2
float result= (8*c-b)/(2*a);

system.out.println("result:"+ result+" reslut: "+(int)result);
// bai 3

float p=(float)(a+b+c)/2;
float s=(float) math.sqrt(p*(p-a)*(p-b)*(p-c));
system.out.println("dien tich tam giac s:"+s);

float cos_a=(float)(b*b+c*c-a*a)/(2*b*c);
float cos_b=(float)(a*a+c*c-b*b)/(2*a*c);
float cos_c=(float)(b*b+a*a-c*c)/(2*b*a);

system.out.println("goc a:"+ math.todegrees(math.acos(cos_a)));
system.out.println("goc b:"+ math.todegrees(math.acos(cos_b)));
system.out.println("goc c:"+ math.todegrees(math.acos(cos_c)));

}
}

**dominator9x** · 04-25-2014, 07:00 AM

hix các sep không chấm bài nữa ah e nộp tiếp này
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Mã nguồn PHP:


[color=#000000]
 [/color][color=#007700]public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {        [/color][color=#0000bb]int a[/color][color=#007700],[/color][color=#0000bb]b[/color][color=#007700],[/color][color=#0000bb]c[/color][color=#007700];        [/color][color=#0000bb]a[/color][color=#007700]=[/color][color=#0000bb]10[/color][color=#007700];[/color][color=#0000bb]b[/color][color=#007700]=[/color][color=#0000bb]5[/color][color=#007700];[/color][color=#0000bb]c[/color][color=#007700]=[/color][color=#0000bb]6[/color][color=#007700];        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phan du khi chia a cho 3 la:"[/color][color=#007700]+ [/color][color=#0000bb]a[/color][color=#007700]%[/color][color=#0000bb]3[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phan du khi chia b cho 3 la:"[/color][color=#007700]+ [/color][color=#0000bb]b[/color][color=#007700]%[/color][color=#0000bb]3[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phan du khi chia c cho 3la :"[/color][color=#007700]+ [/color][color=#0000bb]c[/color][color=#007700]%[/color][color=#0000bb]3[/color][color=#007700]);        [/color][color=#0000bb]a[/color][color=#007700]++;[/color][color=#0000bb]b[/color][color=#007700]++; [/color][color=#0000bb]c[/color][color=#007700]++;        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"a="[/color][color=#007700]+[/color][color=#0000bb]a[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"b="[/color][color=#007700]+[/color][color=#0000bb]b[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"c="[/color][color=#007700]+[/color][color=#0000bb]c[/color][color=#007700]);    }}[/color]

</blockquote></div>
</div>
</div>
bài 2
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Mã nguồn PHP:


[color=#000000]
  [/color][color=#007700]public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {        [/color][color=#0000bb]float a[/color][color=#007700],[/color][color=#0000bb]b[/color][color=#007700],[/color][color=#0000bb]c[/color][color=#007700],[/color][color=#0000bb]x[/color][color=#007700];        [/color][color=#0000bb]a[/color][color=#007700]=[/color][color=#0000bb]20f[/color][color=#007700];[/color][color=#0000bb]b[/color][color=#007700]=[/color][color=#0000bb]8f[/color][color=#007700];[/color][color=#0000bb]c[/color][color=#007700]=[/color][color=#0000bb]7f[/color][color=#007700];        if ([/color][color=#0000bb]a[/color][color=#007700]==[/color][color=#0000bb]0[/color][color=#007700])                { [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"so a phai khac o;"[/color][color=#007700]); }        else        {[/color][color=#0000bb]x[/color][color=#007700]=([/color][color=#0000bb]8[/color][color=#007700]*[/color][color=#0000bb]c[/color][color=#007700]-[/color][color=#0000bb]b[/color][color=#007700])/([/color][color=#0000bb]2[/color][color=#007700]*[/color][color=#0000bb]a[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"x="[/color][color=#007700]+[/color][color=#0000bb]x[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"x da ep la: "[/color][color=#007700]+(int)[/color][color=#0000bb]x[/color][color=#007700]);                }    }}[/color]

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bài 3:
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[color=#000000]
 [/color][color=#007700]public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {        [/color][color=#0000bb]double a[/color][color=#007700]=[/color][color=#0000bb]3d[/color][color=#007700],[/color][color=#0000bb]b[/color][color=#007700]=[/color][color=#0000bb]4d[/color][color=#007700],[/color][color=#0000bb]c[/color][color=#007700]=[/color][color=#0000bb]5d[/color][color=#007700],[/color][color=#0000bb]s[/color][color=#007700],[/color][color=#0000bb]p[/color][color=#007700];        [/color][color=#0000bb]p[/color][color=#007700]=([/color][color=#0000bb]a[/color][color=#007700]+[/color][color=#0000bb]b[/color][color=#007700]+[/color][color=#0000bb]c[/color][color=#007700])/[/color][color=#0000bb]2[/color][color=#007700];        [/color][color=#0000bb]s[/color][color=#007700]=[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]sqrt[/color][color=#007700]([/color][color=#0000bb]p[/color][color=#007700]*([/color][color=#0000bb]p[/color][color=#007700]-[/color][color=#0000bb]a[/color][color=#007700])*([/color][color=#0000bb]p[/color][color=#007700]-[/color][color=#0000bb]b[/color][color=#007700])*([/color][color=#0000bb]p[/color][color=#007700]-[/color][color=#0000bb]c[/color][color=#007700]));        [/color][color=#0000bb]double d[/color][color=#007700]=[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]acos[/color][color=#007700]([/color][color=#0000bb]s[/color][color=#007700]/([/color][color=#0000bb]0.5[/color][color=#007700]*[/color][color=#0000bb]b[/color][color=#007700]*[/color][color=#0000bb]c[/color][color=#007700])),[/color][color=#0000bb]e[/color][color=#007700]=[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]acos[/color][color=#007700]([/color][color=#0000bb]s[/color][color=#007700]/([/color][color=#0000bb]0.5[/color][color=#007700]*[/color][color=#0000bb]a[/color][color=#007700]*[/color][color=#0000bb]c[/color][color=#007700])),[/color][color=#0000bb]f[/color][color=#007700]=[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]acos[/color][color=#007700]([/color][color=#0000bb]s[/color][color=#007700]/([/color][color=#0000bb]0.5[/color][color=#007700]*[/color][color=#0000bb]a[/color][color=#007700]*[/color][color=#0000bb]b[/color][color=#007700]));        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"goc a la "[/color][color=#007700]+[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]todegrees[/color][color=#007700]([/color][color=#0000bb]d[/color][color=#007700])+[/color][color=#dd0000]"; goc b la:"[/color][color=#007700]+[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]to[/color][color=#007700]+[/color][color=#dd0000]"; goc c la:"[/color][color=#007700]+[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]todegrees[/color][color=#007700]([/color][color=#0000bb]f[/color][color=#007700])+[/color][color=#dd0000]" ;"[/color][color=#007700]);       }}[/color]

</blockquote></div>
</div>
</div>

**hoanganhtk16** · 05-06-2014, 07:00 AM

bài 1:
public static void main(string[] args)
{
int a=2,b=3,c=4;
system.out.println("tìm phần nguyên khi chia các số này cho 2");
system.out.println("a/2
=" +a/2+ "
b/2
="+b/2+"
c/2
="+c/2);
system.out.println("tìm phần dư khi chia các số này cho 3, in kết quả ra màn hình.");
system.out.println("a%3
="+a%3+ "
b%3
="+b%3+"
c%3
="+c%3);

system.out.println("tăng giá trị a, b, c mỗi biến lên 1, in giá trị 3 số ra màn hình");

a+=1;
system.out.println(a);
b+=1;
system.out.println(b);
c+=1;
system.out.println(c);
}

bài 2:
public static void main(string[] args)
{
float a=2.3f ,b=1.2f ,c=4.3f;
float x;
int y;
x=(8*c-b)/(2*a);
system.out.println(x);

y=(int) x;
system.out.println("số nguyên ép kiểu từ số thực là: " + y);
// todo code application logic here
}
bài 3:
public static void main(string[] args)
{
double a=33, b=56, c=34, h, goca, gocb, gocc;
double s,dt,p;
p= (a+b+c)/2;
system.out.println("chu vi tam giac :"+p);
s=(p*(p-a)*(p-b)*(p-c));
dt= math.sqrt(s);
system.out.println("dien tich tam giac la:"+dt);

h=(dt*2)/b;
goca=h/a;
goca=math.sin(goca);
goca=math.todegrees(goca);
system.out.println("goc a :" +goca);

gocb=h/b;
gocb=math.sin(gocb);
gocb=math.todegrees(gocb);
system.out.println("goc b: "+gocb);

gocc=h/c;
gocc=math.sin(c);
gocc=math.todegrees(gocc);
system.out.println("goc c :" +gocc);

// todo code application logic here
}

**bsvinh** · 06-19-2014, 07:00 AM

Mã nguồn PHP:


[color=#000000]
[/color][color=#ff8000]//bài tập        //bai1[/color][color=#007700]public class [/color][color=#0000bb]helloworld [/color][color=#007700]{    public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {        [/color][color=#0000bb]int q[/color][color=#007700], [/color][color=#0000bb]k [/color][color=#007700],[/color][color=#0000bb]p[/color][color=#007700];        [/color][color=#0000bb]q[/color][color=#007700]= [/color][color=#0000bb]5[/color][color=#007700];        [/color][color=#0000bb]k [/color][color=#007700]=[/color][color=#0000bb]8[/color][color=#007700];        [/color][color=#0000bb]p [/color][color=#007700]=[/color][color=#0000bb]17[/color][color=#007700];        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phan nguyên của (q:2) là: "[/color][color=#007700]+[/color][color=#0000bb]q[/color][color=#007700]/[/color][color=#0000bb]2[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phan nguyên của (k:2) là: "[/color][color=#007700]+[/color][color=#0000bb]k[/color][color=#007700]/[/color][color=#0000bb]2[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phan nguyên của (p:2) là: "[/color][color=#007700]+[/color][color=#0000bb]p[/color][color=#007700]/[/color][color=#0000bb]2[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"
"[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"so du của (q:2) là: "[/color][color=#007700]+[/color][color=#0000bb]q[/color][color=#007700]%[/color][color=#0000bb]2[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"so du của (k:2) là: "[/color][color=#007700]+[/color][color=#0000bb]k[/color][color=#007700]%[/color][color=#0000bb]2[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"so du của (p:2) là: "[/color][color=#007700]+[/color][color=#0000bb]p[/color][color=#007700]%[/color][color=#0000bb]2[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"
"[/color][color=#007700]);        [/color][color=#0000bb]q[/color][color=#007700]++;        [/color][color=#0000bb]k[/color][color=#007700]++;        [/color][color=#0000bb]p[/color][color=#007700]++;        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"gia tri cua q, k, q sau khi tang len la: "[/color][color=#007700]+[/color][color=#0000bb]q[/color][color=#007700]+[/color][color=#dd0000]" , "[/color][color=#007700]+[/color][color=#0000bb]k[/color][color=#007700]+[/color][color=#dd0000]" , "[/color][color=#007700]+[/color][color=#0000bb]p[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"
"[/color][color=#007700]);        [/color][color=#ff8000]//bai2        [/color][color=#0000bb]float o[/color][color=#007700], [/color][color=#0000bb]w[/color][color=#007700], [/color][color=#0000bb]z[/color][color=#007700], [/color][color=#0000bb]j[/color][color=#007700];        [/color][color=#0000bb]o [/color][color=#007700]= [/color][color=#0000bb]2.7f[/color][color=#007700];        [/color][color=#0000bb]w [/color][color=#007700]= [/color][color=#0000bb]1.5f[/color][color=#007700];        [/color][color=#0000bb]z [/color][color=#007700]= [/color][color=#0000bb]5.2f[/color][color=#007700];        if([/color][color=#0000bb]o[/color][color=#007700]!= [/color][color=#0000bb]0[/color][color=#007700])        {            [/color][color=#0000bb]j [/color][color=#007700]= (([/color][color=#0000bb]8[/color][color=#007700]*[/color][color=#0000bb]z[/color][color=#007700])-[/color][color=#0000bb]w[/color][color=#007700])/([/color][color=#0000bb]2[/color][color=#007700]*[/color][color=#0000bb]o[/color][color=#007700]);            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"gia tri j tim duoc la: "[/color][color=#007700]+[/color][color=#0000bb]j[/color][color=#007700]);            [/color][color=#0000bb]j [/color][color=#007700]= (int) [/color][color=#0000bb]j[/color][color=#007700];            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"gia tri cua j sau khi ep kieu la: "[/color][color=#007700]+[/color][color=#0000bb]j[/color][color=#007700]);        }        else        {            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"a khong duoc bang 0"[/color][color=#007700]);        }        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"
"[/color][color=#007700]);        [/color][color=#ff8000]//bài3        [/color][color=#0000bb]float canh1[/color][color=#007700], [/color][color=#0000bb]canh2[/color][color=#007700],[/color][color=#0000bb]canh3[/color][color=#007700], [/color][color=#0000bb]dt[/color][color=#007700], [/color][color=#0000bb]cv[/color][color=#007700];        [/color][color=#0000bb]canh1 [/color][color=#007700]= [/color][color=#0000bb]5[/color][color=#007700];        [/color][color=#0000bb]canh2 [/color][color=#007700]= [/color][color=#0000bb]6[/color][color=#007700];        [/color][color=#0000bb]canh3 [/color][color=#007700]= [/color][color=#0000bb]7[/color][color=#007700];        [/color][color=#0000bb]cv [/color][color=#007700]= (float)([/color][color=#0000bb]canh1 [/color][color=#007700]+ [/color][color=#0000bb]canh2 [/color][color=#007700]+ [/color][color=#0000bb]canh3[/color][color=#007700])/[/color][color=#0000bb]2[/color][color=#007700];        [/color][color=#0000bb]dt [/color][color=#007700]= (float)([/color][color=#0000bb]cv[/color][color=#007700]*([/color][color=#0000bb]cv[/color][color=#007700]-[/color][color=#0000bb]canh1[/color][color=#007700])*([/color][color=#0000bb]cv[/color][color=#007700]-[/color][color=#0000bb]canh2[/color][color=#007700])*([/color][color=#0000bb]cv[/color][color=#007700]-[/color][color=#0000bb]canh3[/color][color=#007700]));        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"dien tich cua tam giac là: "[/color][color=#007700]+[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]sqrt[/color][color=#007700]([/color][color=#0000bb]dt[/color][color=#007700]));        [/color][color=#0000bb]double goc1[/color][color=#007700]= (float)[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]acos[/color][color=#007700](([/color][color=#0000bb]canh2 [/color][color=#007700]*[/color][color=#0000bb]canh2[/color][color=#007700]+[/color][color=#0000bb]canh1[/color][color=#007700]*[/color][color=#0000bb]canh1[/color][color=#007700])- ([/color][color=#0000bb]canh3[/color][color=#007700]*[/color][color=#0000bb]canh3[/color][color=#007700])/([/color][color=#0000bb]2[/color][color=#007700]*[/color][color=#0000bb]canh2[/color][color=#007700]*[/color][color=#0000bb]canh1[/color][color=#007700]));        [/color][color=#0000bb]double goc2[/color][color=#007700]= (float)[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]acos[/color][color=#007700](([/color][color=#0000bb]canh1 [/color][color=#007700]*[/color][color=#0000bb]canh1[/color][color=#007700]+[/color][color=#0000bb]canh3[/color][color=#007700]*[/color][color=#0000bb]canh3[/color][color=#007700])- ([/color][color=#0000bb]canh2[/color][color=#007700]*[/color][color=#0000bb]canh2[/color][color=#007700])/([/color][color=#0000bb]2[/color][color=#007700]*[/color][color=#0000bb]canh3[/color][color=#007700]*[/color][color=#0000bb]canh1[/color][color=#007700]));        [/color][color=#0000bb]double goc3[/color][color=#007700]= (float)[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]acos[/color][color=#007700](([/color][color=#0000bb]canh3 [/color][color=#007700]*[/color][color=#0000bb]canh3[/color][color=#007700]+[/color][color=#0000bb]canh2[/color][color=#007700]*[/color][color=#0000bb]canh2[/color][color=#007700])- ([/color][color=#0000bb]canh1[/color][color=#007700]*[/color][color=#0000bb]canh1[/color][color=#007700])/([/color][color=#0000bb]2[/color][color=#007700]*[/color][color=#0000bb]canh3[/color][color=#007700]*[/color][color=#0000bb]canh2[/color][color=#007700]));                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"so do cua 3 goc la: "[/color][color=#007700]+[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]todegrees[/color][color=#007700]([/color][color=#0000bb]goc1[/color][color=#007700])+[/color][color=#dd0000]" , "[/color][color=#007700]+[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]todegrees[/color][color=#007700]([/color][color=#0000bb]goc2[/color][color=#007700])+[/color][color=#dd0000]" , "[/color][color=#007700]+[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]todegrees[/color][color=#007700]([/color][color=#0000bb]goc3[/color][color=#007700]));}}              [/color]

Chủ đề: Bài 4: Toán tử và biểu thức, hàm toán học trong Java

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