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78能组成几个不同的两位数

更新时间: 2020-09-21 00:00:00     

将数字7放于十位,数字8放于个位;或将数字8放于十位,数字7放于个位。

所以7,8能组成2个不同的两位数,分别为78和87。

关键词: 组成 不同 位数

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