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[cuongdan]

$\left\{\begin{matrix} x+y^2+ \frac{2(1-y)}{x}=y\sqrt{x^2y-x^3-1}+\sqrt{3(y-x+1)}& & \\ \frac{x}{\sqrt{xy-x^2-1}}=\frac{xy+x-2}{\sqrt{xy+2x-1}} & & \end{matrix}\right.$