Khi tra loi kiem tra mon toan cua lop 5A , co giao noi : So diem 10 chiem 25 phan tram so diem 9 nhieu
hon so diem 10 la 6,25 phan tram , nhu vay co 18 ban duoc diem 10 hoac 9 , tat ca so HS trong lop deu
nop bai kiem tra . Hoi lop 5A co bao nhieu ban HS