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6/13乘5/12加7/12乘5/13简便方法计算
人气：415 ℃　时间：2019-11-10 22:29:17
解答
6/13×5/12+7/12×5/13
= (6×5+7×5)/(13×12)
= [5×(6+7)]/(13×12)
= (5×13)/(13×12)
= 5/12
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