Giải hệ phương trình:
1) $\left\{\begin{matrix} x^2y^3+3x^2-4x+2=0\\x^2y^2-2x+y^2=0 \end{matrix}\right.$
2) $\left\{\begin{matrix} x^3+3xy^2=6xy-3x-49\\x^2-8xy+y^2=10y-25x-9 \end{matrix}\right.$
3) $\left\{\begin{matrix} x^2y^2-8x+y^2=0\\2x^2-4x+10+y^3=0 \end{matrix}\right.$
4) $\left\{\begin{matrix} x^3(3y+55)=64\\xy(y^2+3y+3)=12+51x \end{matrix}\right.$