用简便方法计算.
(1)2.4×1.2+7.6×1.2
(2)0.25×38.6×0.4
(3)(4+0.4)×25
(4)0.8×4.6×12.5
(5)4.9×99
(6)12.8+12.8×9
(7)0.125×0.32×2.5
(8)0.99÷1.5
(9)9.9×9+9.9.
用简便方法计算.
(1)2.4×1.2+7.6×1.2
(2)0.25×38.6×0.4
(3)(4+0.4)×25
(4)0.8×4.6×12.5
(5)4.9×99
(6)12.8+12.8×9
(7)0.125×0.32×2.5
(8)0.99÷1.5
(9)9.9×9+9.9.