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口算速算法技巧
更新时间: 2021-06-02 16:57:05  

1、个位数是“1” 速算口诀:头乘头,头加头,尾是1(头加头如果超过10要进位)。

2、十位数是“1” 速算口诀:头是1,尾加为,尾乘尾(超过10要进位)。

3、个位数都是“9” 速算口诀:头数各加1 ,相乘再乘10,减去相加数,最后再放1。

关键词: 算法 技巧

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