mot thua hinh thang co day lon la 140 day bè̉̉ băng̀ 1/2 day lon va kem chieu cao 30cm .TINH DIEN TICH THUA RUONG DO . NGUOI TA TRONG LUA TREN THUA RUONG DO TRUNG BINH CU 100M THU HOACH DUOC 62KG THOC .HOI TREN THUA RUONG DO NGUOI TA THU HOACH BAO NHIEU KG ?
( 140 + 70 ) × 100 : 2 = 10 500 (m²)
( 140 + 70 ) x 100 : 2 = 10500 (m2)