1 thua ruong hinh thang co day be 62m day lon gap doi day be chieu cao bang 15,5 m a) tinh dien tich thua ruong hinh thang b) nam truoc thua ruong do thu hoach duoc 880kg thoc,nam nay tang hon nam truoc 15%.hoi nam nay thua ruong thu hoacg duoc bao nhieu tan thoc