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25x39怎么用简便算法计算

更新时间: 2020-07-07 00:00:00     

39与40相近,所以可以将39变成40减1,25乘39就变成了25乘40减1的差,利用乘法分配律,25乘39的结果就变成25乘40的积减25乘1的积,25乘40等于1000,25乘1等于25,1000减25等于975。

关键词: 25x39 怎么 简便 算法 计算

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