Mot cua hang can cho 21000 kg hang bang o to Co 2 loai o to loai thu nhat moi xe cho duoc 2000 kg mot chuyen loao thu hai moi xe cho duoc 15000 kg mot chuyen Hoi cua hang can it nhat bao nhieu xe de cho duoc het so hang neu
a] Chi dung xe oto loai 1
b]Chi dung xe o to loai 2
c] Dung ca 2 loai o to voi so luong nhu nhau