Cho phương trình $2x^{2}+\left ( x+a \right )^{2}+\left ( x+b \right )^{2}=c^{2}$. Chứng minh $4c^{2}\geq 3\left ( a^{2}+b^{2} \right )-2ab$.
$2x^{2}+\left ( x+a \right )^{2}+\left ( x+b \right )^{2}=c^{2}$
Started By phathuy, 17-05-2013 - 14:56
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