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(31+34+37+41+43)-(25+27+29+31+33)怎么简便计算
人气:348 ℃ 时间:2020-04-06 19:41:03
解答
(31-31)+(37-27)+(43-33)+(34+41-25)-29
=10+10+50-29
=70-30+1
=41
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