若mn为正数,已知m+n=2√mn求(3m-2n+√mn)/(3√mn-4n)
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若mn为正数,已知m+n=2√mn求(3m-2n+√mn)/(3√mn-4n)
(√m-√n)^2=0
m=n
(3m-2n+√mn)/(3√mn-4n)=2m/(-m)=-2
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