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个位比十位大1的两位数是多少

更新时间: 2020-10-31 00:00:00     

个位比十位大1的两位数是:12、23、34、45、56、67、78、89。设原来的两位数为10ab,根据题意得:10ab9=10b+1,解得:b=a+1,因为可取1到8个数,所以这两位数共有8个,它们分别:12、23、34、45、56、67、78、89,它们都是个位数字比十位数字大1的两位数。

关键词: 个位 位数 多少

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