Giải hệ phương trình
$\ \left\{\begin{matrix} x+y+z=6 & \\ \frac{xy+xz+yz}{\sqrt{x}+\sqrt{y}+\sqrt{z}}=2\sqrt{2} & \end{matrix}\right.$
Edited by OiDzOiOi, 10-10-2015 - 21:38.
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