计算(4mn-m^2-4n^2)/(2n-m)
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计算(4mn-m^2-4n^2)/(2n-m)计算(4mn-m^2-4n^2)/(2n-m)计算(4mn-m^2-4n^2)/(2n-m)(4mn-m^2-4n^2)/(2n-m)=-(2n-m)^2
计算(4mn-m^2-4n^2)/(2n-m)
计算(4mn-m^2-4n^2)/(2n-m)
计算(4mn-m^2-4n^2)/(2n-m)
(4mn-m^2-4n^2)/(2n-m) = - (2n-m)^2/(2n-m)=-(2n-m) =m-2n
(4mn-m^2-4n^2)/(2n-m) = - (2n-m)^2/(2n-m)=-(2n-m)
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