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[9/10-(1/4+7/20)]/4/5的简便方法
人气:409 ℃ 时间:2020-04-28 05:31:28
解答
[9/10-(1/4+7/20)]/4/5
=[9/10-(1/4+7/20)]*5/4
=[9/10-7/20-1/4]*5/4
=[9/20-1/4]*5/4
=5/4*9/20-5/4*1/4
=9/16-5/16
=4/16
=1/4
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