1. (2020五上·丹徒月考) 能用简便方法计算的用简便方法计算。

①4.8×18.4＋4.8×1.6

②1.72＋0.28×1.2

③8.5×101-8.5

④0.25×1.25×3.2

⑤135÷[（3.45－1.65）×2.5]

⑥3.7÷2.5÷0.4