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计算口算的快速方法
更新时间: 2021-05-21 11:27:25  

1、首先99乘法必须要烂熟于心,这个是关键。

2、然后还有在做多位数加减乘除时,最好能从高位到低位算,边说着前面的数字,边计算后面的,而且能节省所谓借位,退位的时间。

3、最后当然多练习还是最重要的,熟能生巧。

关键词: 计算 快速 方法

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