de bai viet chu hoac so thich hop vao cho cham
a ) muon tinh dien tich hinh tam giac ta lay ..........................................................................................................................................................................................................................................................................................................................................................
b) muon tinh dien tich hinh thang ta lay ........................................................................................................................................................................................................................................................................................................................................................................................
c ) de tinh dien tich xung quanh hinh hop chu nhat ta lay ...................................................nhan ..........................................( cung mot don vi do )
d) neu canh cua mot hinh vuong gap len .3 lan thi dien tich cua hinh vuong do gap len...........lan
e) neu canh cua mot hinh lap phuong gap len 3 lan thi the tich cua hinh vuong do gap len .........................lan
ai k minh roi minh k lai
