mot can phong hinh hop chu nhat co kich thuoc : dai 6m ,rong 4.5m ,cao 3.5m .Nguoi ta quet voi tuong va tran nha phia trong can phong . Hoi dien tich can quet voi la bao nhieu met vuong ?Biet dien tich cua ra vao va cua so cua can phong rong 9 m2.
moi nguoi giup mk nhe!