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若m2-4mn+4n2=0,求m+n/m-n
人气:455 ℃ 时间:2020-06-01 00:49:53
解答
m^2-4mn+4n^2=0
==>(m-2n)^2=0
==>m=2n
m+n/m-n
=2n+n/2n-n
=3n/n
=3
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