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若(2m-n)²=3mn,求代数式n/m+4m/n-1的值
人气:395 ℃ 时间:2020-03-28 15:37:21
解答
(2m-n)²=3mn,
=> 4m^2+n^2=7mn,
=> 4m/n+n/m=7,
=> n/m+4m/n-1=7-1=6
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