V
vansang95


Cho x;y;z dươngCMR
[TEX] \frac{2x}{x^6+y^4}+\frac{2y}{y^6+z^4}+\frac{2z}{z^6+x^4}\leq\frac{1}{x^4}+\frac{1}{y^4}+\frac{1}{z^4}[/TEX]
[TEX] \frac{2x}{x^6+y^4}+\frac{2y}{y^6+z^4}+\frac{2z}{z^6+x^4}\leq\frac{1}{x^4}+\frac{1}{y^4}+\frac{1}{z^4}[/TEX]