trong cac cau sau day, cau nao dung, cau nao sai? Cho vi du minh hoa doi vs cac cau sai:

a) Tong cua 2 so nguyen am la 1 so nguyen am.

b)Tong cua 2 so nguyen duong la 1 so nguyen duong

c)Tich cua 2 so nguyen am la 1 so nguyen am

d)Tong cua 2 so nguyen duong la 1 so nguyen duong

hay neu ten cua may co don gian ma nguoi ta dung trong cac dung cu sau :

- Keo 1 thung betong len cao de do tran nha.

- Dua 1 thung phuy nang tu mat duong len san xe tai.

-Cai chan oto tai nhung diem ban ve tren duong cao toc

hay neu ten 3 loai may co don gian ma em dc hoc

viet cong thuc tinh khoi luong hrieng theo khoi luong va the tich