thienthanaotrang

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

$\left\{\begin{matrix} \sqrt{2x^{2}+1}-1=x(\sqrt{y+1}-\sqrt{y-1}) & \\ x(x-2)+(y-1)^{4}=2xy(y-2) & \end{matrix}\right.$

$\left\{\begin{matrix} (x^{2}+9)(x^{9}+9y)=22(y-1)^{2} & \\ x^{2}-2-4y\sqrt{y+1}=0 & \end{matrix}\right.$

$\left\{\begin{matrix} (x^{2}+9)(x^{9}+9y)=22(y-1)^{2} & \\ x^{2}-2-4y\sqrt{y+1}=0 & \end{matrix}\right.$

$\left\{\begin{matrix} (2x-1)^{2}+4(y-1)^{2}=51 & \\ xy(x-1)(y-2)=-20 & \end{matrix}\right.$