Cho `2x^2` `+` `2y^2` = `5xy` Chứng minh $\frac{x-y}{x+y}$ `=` `1/3` `(x>y>0)`

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Cho `2x^2` `+` `2y^2` = `5xy`
Chứng minh $\frac{x-y}{x+y}$ `=` `1/3` `(x>y>0)`

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