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什么叫平十法如何解
更新时间: 2020-09-23 00:00:00  

平十法是计算20以内退位减法一种方法。是把减数分成两个数,被减数减去第一个数后要等于10,然后再用10来减去第二个数得出最终结果。比如15减7,可以把7分成5和2,先用15减5等于10,然后再用10减2等于8,即可。

平十法的关键在于,先分析到个位不够减,那么就把减数分解为两个数。

关键词: 什么 如何

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