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凑十法计算九加九等于18怎么算

更新时间: 2020-07-13 00:00:00     

1、将九加九写成十减一加九,利用加减法交换律得到十加九减一的差,即十加八得到十八。

2、凑十法是指数字相加,凑整十然后再相加,从而使计算变得简便。例如:5加7用凑十法得到10减5加7,即10加7减5的差得到10加2等于12。

关键词: 计算 等于 怎么

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