co 3 khoi lap phuong nhu nhau canh 8cm
a} nguoi ta sep thanh 1khoi hop chu nhat .Tinh the tich cua khoi hop chu nhat vua xep duoc
b¦ ban thu da dung day va do duoc duong cheo cua cac khoi lap phuong do ma khong cat tung khoi lap phuong ra .Em co lam duoc nhu ban thu khong? Ve hinh minh hoa