minh la dan moi hoc nen k biet gi ae jup minh sua loi nay voi...minh viet 1 app nho tinh tong 2 so nguyen makviet xong run app thi no bi loi dong ung dung...may ban giup minh coi mimnh sai cho nao

day la link anh:https://docs.google.com/document/d/19hdj9zjfzm9bs_xmicze-4qkodcclsgepkkkd2bikgi/edit

mong ae giup minh