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计算(4mn-m^2-4n^2)/(2n-m)
人气:491 ℃ 时间:2020-05-21 12:59:43
解答
(4mn-m^2-4n^2)/(2n-m) = - (2n-m)^2/(2n-m)=-(2n-m) =m-2n
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