Cho $a,b,c\geq 0$. Chứng minh rằng:
$\sqrt{5a^2+4bc}+\sqrt{5b^2+4ca}+\sqrt{5c^2+4ab}\geq \sqrt{3\left ( a^2+b^2+c^2 \right )}+2\left ( \sqrt{ab}+\sqrt{bc}+\sqrt{ca} \right )$
Cho $a,b,c\geq 0$. Chứng minh rằng:
$\sqrt{5a^2+4bc}+\sqrt{5b^2+4ca}+\sqrt{5c^2+4ab}\geq \sqrt{3\left ( a^2+b^2+c^2 \right )}+2\left ( \sqrt{ab}+\sqrt{bc}+\sqrt{ca} \right )$
$$\mathbf{\text{Every saint has a past, and every sinner has a future}}.$$
Cho $a,b,c\geq 0$. Chứng minh rằng:
$\sqrt{5a^2+4bc}+\sqrt{5b^2+4ca}+\sqrt{5c^2+4ab}\geq \sqrt{3\left ( a^2+b^2+c^2 \right )}+2\left ( \sqrt{ab}+\sqrt{bc}+\sqrt{ca} \right )$
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