

1,a,[tex] \left\{\begin{matrix} x^{2}+x^{3}y-xy^{2}+xy-y=1 & & \\ x^{4}+y^{2}-xy\left ( 2x-1 \right )= 1& & \end{matrix}\right.[/tex]
b,[tex] \left\{\begin{matrix} x^{3} +3x^{2}+4x+2= y^{3}+y& & \\ 4x+6\sqrt{x+1}+7= \left ( 4x-1 \right )y & & \end{matrix}\right.[/tex]
b,[tex] \left\{\begin{matrix} x^{3} +3x^{2}+4x+2= y^{3}+y& & \\ 4x+6\sqrt{x+1}+7= \left ( 4x-1 \right )y & & \end{matrix}\right.[/tex]