B
baochauhn1999


Cho: $x;y;z$>$0$ và: $x+y+z$\leq$1$. CMR:
$P=\sqrt{x^2+\frac{1}{x^2}}+\sqrt{y^2+\frac{1}{y^2}}+\sqrt{z^2+\frac{1}{z^2}}$\geq$\sqrt{82}$
$P=\sqrt{x^2+\frac{1}{x^2}}+\sqrt{y^2+\frac{1}{y^2}}+\sqrt{z^2+\frac{1}{z^2}}$\geq$\sqrt{82}$
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