Let be positive real numbers. Prove that:
$\sqrt{\frac{a^2(b^2+c^2)}{a^2+bc}}+\sqrt{\frac{b^2(c^2+a^2)}{b^2+ca}}+\sqrt{\frac{c^2(a^2+b^2)}{c^2+ab}} \leq a+b+c$
Let be positive real numbers. Prove that:
$\sqrt{\frac{a^2(b^2+c^2)}{a^2+bc}}+\sqrt{\frac{b^2(c^2+a^2)}{b^2+ca}}+\sqrt{\frac{c^2(a^2+b^2)}{c^2+ab}} \leq a+b+c$
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