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Cho [TEX]x,y >0, x^2 + y^2 =\frac 23[/TEX]
CMR[TEX] \frac{x }{1 - x^2 + \frac{y}{1 - y^2} \geq \frac 23[/TEX]
Tham khảo : http://diendan.hocmai.vn/showthread.php?t=4917
CMR[TEX] \frac{x }{1 - x^2 + \frac{y}{1 - y^2} \geq \frac 23[/TEX]
Tham khảo : http://diendan.hocmai.vn/showthread.php?t=4917
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