ngominhhoang
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Cho x,y,z dương . CM
\[\frac{2x}{x^{6}+y^{4}}+\frac{2y}{y^{6}+z^{4}}+\frac{2z}{z^{6}+x^{4}}\leq \frac{1}{x^{4}}+\frac{1}{y^{4}}+\frac{1}{z^{4}}\]
\[\frac{2x}{x^{6}+y^{4}}+\frac{2y}{y^{6}+z^{4}}+\frac{2z}{z^{6}+x^{4}}\leq \frac{1}{x^{4}}+\frac{1}{y^{4}}+\frac{1}{z^{4}}\]