M
mauhongcuocsong96


cho x,y,z >0 ; xy+yz+zx=xyz. CMR:
[TEX]\frac{y}{x^2}+\frac{x}{z^2}+\frac{z}{y^2} \geq 3 (\frac{1}{x^2}+\frac{1}{z^2}+\frac{1}{y^2})[/TEX]
Chú ý latex
[TEX]\frac{y}{x^2}+\frac{x}{z^2}+\frac{z}{y^2} \geq 3 (\frac{1}{x^2}+\frac{1}{z^2}+\frac{1}{y^2})[/TEX]
Chú ý latex
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