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7/13×(4/5÷7/39)简便计算
人气:151 ℃ 时间:2020-03-20 01:38:44
解答
7/13×(4/5÷7/39)
=7/13×4/5×39/7
=7/13×39/7×4/5
=3×4/5
=12/5
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