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数学速算乘法方法
更新时间: 2021-04-29 15:23:14  

1、十位数和比他大1的数相乘,作为结果的“千位与百位”

2、个位数相乘,作为结果的十位与个位

3、最后把1和2计算的结果按照顺序写出来就是最终结果。

4、举个例子:85*85。8*9等于72作为运算结果的千位和百位,5*5等于25作为运算结果的十位和个位,将1和2运算的结果按照顺序写出来就是7225。

关键词: 数学 乘法 方法

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