简便方法计算2.4*0.25 0.25×2.8怎样简便计算？
0.25×2.8怎样简便计算？0.25×2.80.25×4x0.71x0.70.7 0.25x0.4的简便计算？0.25×0.425×0.01×4×0.125×
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