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(8-6/13-7/13)×2/7,简便计算,
人气:480 ℃ 时间:2019-12-19 01:33:09
解答
(8-6/13-7/13)×2/7
=[8-(6/13-7/13)]×2/7
=[8-1]×2/7
=7×2/7
=2
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