a, $\left\{\begin{matrix} 2x^2-y^2-7x+2y+6=0 & \\ -7x^3+12x^2y-6xy^2+y^3-2x+2y=0 & \end{matrix}\right.$
b, $\left\{\begin{matrix} x^2+y^2=2 & \\ \frac{2x^5}{x+y} + (xy+1)^2 = 5 & \end{matrix}\right.$
c, $\left\{\begin{matrix} (x^2+1)y^4+1=2xy^2(y^3-1) & \\ xy^2(3xy^4-2) = xy^4(x+2y) +1 & \end{matrix}\right.$
Edited by haivana1619, 23-12-2016 - 21:44.