1.25×16×0.79×2.5 简便方法做

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1.25×16×0.79×2.5简便方法做1.25×16×0.79×2.5简便方法做1.25×16×0.79×2.5简便方法做1.25×16×0.79×2.5＝（1.25×8）×（2.5×2）×0.7

1.25×16×0.79×2.5 简便方法做
1.25×16×0.79×2.5 简便方法做

1.25×16×0.79×2.5 简便方法做
1.25×16×0.79×2.5＝（1.25×8）×（2.5×2）×0.79＝50×0.79＝39.5