H
hoangtuan_241190


[TEX]xy +yz +zx = xyz (x,y,z\geq1)[/TEX]
[TEX]CMR :\sqrt{x-1} +\sqrt{y-1} +\sqrt{z-1} \leq\sqrt{2(x+y+z)}[/TEX]
[TEX]CMR :\sqrt{x-1} +\sqrt{y-1} +\sqrt{z-1} \leq\sqrt{2(x+y+z)}[/TEX]