$\left\{\begin{matrix} x+y+\sqrt{x^{2}-y^{2}}=12 & \\ y.\sqrt{x^{2}+y^{2}} =12& \end{matrix}\right.$
$\left\{\begin{matrix} x+y+\sqrt{x^{2}-y^{2}}=12 & \\ y.\sqrt{x^{2}+y^{2}} =12& \end{matrix}\right.$
Started By baotranthaithuy, 09-12-2014 - 15:56
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