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

[binhseo2800]

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public class newclass1 {
   
    public static void main(string[] args) {
        int a, b, c, nguyena, nguyenb, nguyenc, dua, dub, duc;
        a=3;
        b=4;
        c=5;
        nguyena=a/2;
        nguyenb=b/2;
        nguyenc=c/2;
        dua=a%2;
        dub=b%2;
        duc=c%2;
        system.out.println("phan nguyen cua a:"+nguyena);
        system.out.println("phan nguyen cua b:"+nguyenb);
        system.out.println("phan nguyen cua c:"+nguyenc);
        system.out.println("phan du cua a:"+dua);
        system.out.println("phan du cua b:"+dub);
        system.out.println("phan du cua c:"+duc);
        a++;
        b++;
        c++;
        system.out.println("gia tri cua a tang len 1:"+a);
        system.out.println("gia tri cua b tang len 1:"+b);
        system.out.println("gia tri cua c tang len 1:"+c);
    }
}

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public class newclass {
    public static void main(string[] args) {
        float a, b, c, x;
        int songuyen;
        a=1f;
        b=2f;
        c=3f;
        x=(8*c-b)/2*a;
        system.out.println("gia tri cua x la:"+x);
        songuyen=(int)x;
        system.out.println("so thuc ep thanh so nguyen:"+songuyen);
    }
}

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bài 3 mình chưa làm được, mình không rõ sử dụng công thức java
sr m dân ngoại đạo!

[Lumniasess]

bai 3 minh co tham khoa cac ban cac ham va da lam ra: <div class="bbcodeblock bbcodequote bbcmspoilerblock">
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public class student {
    public static void main(string[] args) {
    float a=2;
    float b=3;
    float c=4;
    float p;
    float s;
    p=(float)(a+b+c)/2;
    s= (float) math.sqrt(p*(p-a)*(p-b)*(p-c));
                system.out.println("phan tinh dien tich tam giac");
                system.out.println("dien tich:"+s);
        double goca= math.asin(s/(0.5*b*c));
        double gocb= math.asin(s/(0.5*c*a));
        double gocc= math.asin(s/(0.5*a*b));
                system.out.println("phan tinh goc");
                system.out.println("so do goc a la:"+math.todegrees(goca));
                system.out.println("so do goc a la:"+math.todegrees(gocb));
                system.out.println("so do goc a la:"+math.todegrees(gocc));
 
    }
}

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[giavemaybay]

bài 1:
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[color=#000000]
[/color][color=#007700]public class [/color][color=#0000bb]javabai4 [/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]12 [/color][color=#007700], [/color][color=#0000bb]b [/color][color=#007700]=[/color][color=#0000bb]24 [/color][color=#007700], [/color][color=#0000bb]c [/color][color=#007700]= [/color][color=#0000bb]8[/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]"nguyen chia cho 2: "[/color][color=#007700]+[/color][color=#dd0000]" a="[/color][color=#007700]+([/color][color=#0000bb]a[/color][color=#007700]/[/color][color=#0000bb]2[/color][color=#007700])+[/color][color=#dd0000]" ;b="[/color][color=#007700]+([/color][color=#0000bb]b[/color][color=#007700]/[/color][color=#0000bb]2[/color][color=#007700])+[/color][color=#dd0000]" ;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]"nguyen du cho 3: "[/color][color=#007700]+[/color][color=#dd0000]" a="[/color][color=#007700]+([/color][color=#0000bb]a[/color][color=#007700]%[/color][color=#0000bb]3[/color][color=#007700])+[/color][color=#dd0000]" ;b="[/color][color=#007700]+([/color][color=#0000bb]b[/color][color=#007700]%[/color][color=#0000bb]3[/color][color=#007700])+[/color][color=#dd0000]" ;c="[/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 bien: "[/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] 

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[poohny]

bai 2:
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[color=#000000]
[/color][color=#007700]public class [/color][color=#0000bb]javabai4 [/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]2.5f [/color][color=#007700], [/color][color=#0000bb]b [/color][color=#007700]=[/color][color=#0000bb]4f [/color][color=#007700], [/color][color=#0000bb]c [/color][color=#007700]= [/color][color=#0000bb]6.5f [/color][color=#007700], [/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]);        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]"giai phuong trinh: 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]"giai phuong trinh ep kieu: x="[/color][color=#007700]+ (int)[/color][color=#0000bb]x[/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]"bien a phai khac 0"[/color][color=#007700]);}        }    }[/color] 

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[dolinh2016]

bai 3
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[color=#000000]
[/color][color=#007700]public class [/color][color=#0000bb]javabai4 [/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]3[/color][color=#007700], [/color][color=#0000bb]b[/color][color=#007700]=[/color][color=#0000bb]4[/color][color=#007700], [/color][color=#0000bb]c[/color][color=#007700]=[/color][color=#0000bb]5[/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]=(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]double cos_a[/color][color=#007700]= (float) ([/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]cos_b[/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]cos_c[/color][color=#007700]=([/color][color=#0000bb]b[/color][color=#007700]*[/color][color=#0000bb]b[/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]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]"diện tích của tam giác: "[/color][color=#007700]+ [/color][color=#0000bb]s[/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]"cos_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]acos[/color][color=#007700]([/color][color=#0000bb]cos_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]"cos_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]acos[/color][color=#007700]([/color][color=#0000bb]cos_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]"cos_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]acos[/color][color=#007700]([/color][color=#0000bb]cos_c[/color][color=#007700])));         }}[/color] 

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[ngoczuizui6996vl]

bài 2
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/**
 
public class vidu1 {
 
    /**
    * @param args the command line arguments
    */
    public static void main(string[] args) {
        float a =2.3f;
        float b =4.8f;
        float c =5.12f;
        float x;
        x = (8*c-b)/(2*a);
        int y;
        system.out.println("x="+x);
        y = (int) x;
        system.out.println("ep kieu x ve so nguyen la:"+y);
    }
     
}

[Minhpham.mng]

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package javabasic;
import java.math.*;
public class toantu {
 
 
    public static void main(string[] args) {
        int a=3;
        int b= 5;
        int c=7;
 
        system.out.println(" cau 1a");
        system.out.println(" phan nguyen khi chia a,b,c "+
                "lan luot cho 2 :"+a/2+" ;"+b/2+" ;"+c/2);
        system.out.println(" phan du khi chia a,b,c "+
                "lan luot cho 2 :"+a%2+" ;"+b%2+" ;"+c%2);
 
        system.out.println(" cau 1b ");
        a++;
        b++;
        c++;
        system.out.println(" gia tri cua a, b, c sau" +
                "khi tang la :"+ a +"; "+b+"; "+c);
        system.out.println("---------------------");
        system.out.println(" cau 2");
        float a1= 3.5f;
        float b1=2f;
        float c1= 5f;
        float x= ((8*c1)-b1)/2*a1;
        int epkieu;
        system.out.println(" ket qua cua x :"+x);
        epkieu=(int)x;
        system.out.println("ket qua sau khi ep kieu la :"+epkieu);
 
        system.out.println("---------------------");
        system.out.println(" cau 3");
 
        double a2=3.3f;
        double b2=4f;
        double c2=5.5f;
        double p, s;
        p=(a2+b2+c2)/2;
        // dien tich tam giac
        s= math.sqrt(p*(p-a2)*(p-b2)*(p-c2));
        system.out.println(" dien tich tam giac la :"+s);
        // tim goc tam giac
        double goca= math.acos((b2*b2+c2*c2-a2*a2)/(2*b2*c2));
        double gocb= math.acos((a2*a2+c2*c2-b2*b2)/(2*c2*a2));
        double gocc= math.acos((b2*b2+a2*a2-c2*c2)/(2*a2*b2));
 
        system.out.println("so do goc a là: " + math.todegrees(goca));
        system.out.println("so do goc b là: " + math.todegrees(gocb));
        system.out.println("so do goc c là: " + math.todegrees(gocc));
 
    }
}

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[didosports88]

package bt1bai4;
 
import java.text.decimalformat;
import java.util.scanner;
public class chia {
public static void main (string[] agrs)
    {
scanner sc=new scanner(system.in);
int a,b,c, nguyena, nguyenb, nguyenc, dua,dub,duc;
system.out.println("nhap so a:");
a= sc.nextint();
system.out.println("nhap so b:");
b=sc.nextint();
system.out.println("nhap so c:");
c=sc.nextint();
nguyena= a/2;
nguyenb=b/2;
nguyenc=c/2;
system.out.println("phan nguyena (a:2)la :"+ nguyena);
system.out.println("phan nguyenb (b:2) la :"+nguyenb);
system.out.println("phan nguyenc (c:2) la :"+nguyenc);
dua= a%3;
dub=b%3;
duc=c%3;
system.out.println("phan dua (a:3) la: "+dua);
system.out.println("phan dub(b:3) la: "+dub);
system.out.println("phan duc(c:3) la: "+duc);
decimalformat fmt= new decimalformat("0.##");
a++;
system.out.println("gia tri a da tang len 1, gia tri moi la: "+ a);
b++;
system.out.println("gia tri b da tang len 1, gia tri moi la: "+ b);
c++;
system.out.println("gia tri c da tang len 1, gia tri moi la: "+ c);
}
}
[spoiler][/spoiler]

[dangochinh]

bài 1
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public class bai_4 {
    public static void main(string[] args) {
        int a=5, b=6, c=7;
        system.out.println("phần nguyên của 5/2: "+ a/2);
        system.out.println("phần nguyên của 6/2: "+ b/2);
        system.out.println("phần nguyên của 7/2: "+ c/2);
       
        system.out.println("phần dư của 5/3: "+ a%3);
        system.out.println("phần dư của 6/3: "+ b%3);
        system.out.println("phần dư của 7/3: "+ c%3);
       
        a++;
        system.out.println("tăng giá trị a thêm 1: "+a);
        b++;
        system.out.println("tăng giá trị b thêm 1: "+b);
        c++;
        system.out.println("tăng giá trị c thêm 1: "+c);
    }
}

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bài 2:
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public class bai_3_2 {
    public static void main(string[] args) {
        int a=7, b=4, c=5;
 
        float x=(float) (8*c-b)/(2*a);
        system.out.println("kết quả: "+x);
 
        int y=(int) x;
        system.out.println("kết quả sau khi ép kiểu: "+y);
    }
}

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bài 3
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public class bai_3_3 {
    public static void main(string[] args) {
        float a=3,b=4,c=5;
 
        double chuvi=(a+b+c)/2;
        double dientich=math.sqrt(chuvi*(chuvi-a)*(chuvi-b)*(chuvi-c));
        system.out.println("diện tích tam giác: "+dientich);
       
        double a=math.acos((b*b+c*c-a*a)/(2*b*c));
        system.out.println("số đo góc a: "+math.todegrees(a)+" độ");
        double b=math.acos((a*a+c*c-b*b)/(2*a*c));
        system.out.println("số đo góc b: "+math.todegrees(b)+" độ");
        double c=math.acos((a*a+b*b-c*c)/(2*a*b));       
        system.out.println("số đo góc c: "+math.todegrees(c)+" độ");       
    }
}

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[nguyenthangloith11b]

bài 1:
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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]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]5[/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]11[/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 của a cho 2 là: "[/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 của b cho 2 là: "[/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 của c cho 2 là: "[/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]"phần dư của a cho 3 là: "[/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 của b cho 3 là: "[/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 của c cho 3 là: "[/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]"các số sau khi được tăng lên 1 đơn vị là:"[/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] 

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bài 2
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  [/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]x[/color][color=#007700];      [/color][color=#0000bb]int i[/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]2[/color][color=#007700];      [/color][color=#0000bb]c [/color][color=#007700]= [/color][color=#0000bb]0.5[/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]"phương trình đề bài cho là 2ax+b=8c"[/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]"vậy x = (8c-b)/2a"[/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]"kết quả tìm đươc là 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]i [/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]"kết quả sau khi bị ép kiểu x= " [/color][color=#007700]+[/color][color=#0000bb]i[/color][color=#007700]);  }}[/color] 

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bài 3
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[/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]p[/color][color=#007700],[/color][color=#0000bb]s[/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]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]2[/color][color=#007700];      [/color][color=#0000bb]b [/color][color=#007700]= [/color][color=#0000bb]3[/color][color=#007700];      [/color][color=#0000bb]c [/color][color=#007700]= [/color][color=#0000bb]4[/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]cosa [/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]cosb [/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]cosc [/color][color=#007700]= ([/color][color=#0000bb]b[/color][color=#007700]*[/color][color=#0000bb]b[/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]2[/color][color=#007700]*[/color][color=#0000bb]b[/color][color=#007700]*[/color][color=#0000bb]a[/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]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]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]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"diện tích tam giác abc là: "[/color][color=#007700]+ [/color][color=#0000bb]s[/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]"số đo của góc a là: "[/color][color=#007700]+ [/color][color=#0000bb]a [/color][color=#dd0000]"độ"[/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]"số đo của góc b là: "[/color][color=#007700]+ [/color][color=#0000bb]b [/color][color=#dd0000]"độ"[/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]"số đo của góc c là: "[/color][color=#007700]+ [/color][color=#0000bb]c [/color][color=#dd0000]"độ"[/color][color=#007700]);[/color] 

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cho em hỏi tí ở bài số 3 luc chạy thử thì số đo các góc nó lại hiển thị là nan đó là lỗi gì vạy ạ