(680-620)/(4-1)=20.
680/20=34.
所以写错的是34,另外1个数是20
两位数乘两位数,个位4错写1,结果得620,原来应该得680
两位数乘两位数,个位4错写1,结果得620,原来应该得680
数学人气：367 ℃时间：2020-05-26 14:59:42
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