1, $4x^{3}+18x^{2}+27x+14=\sqrt[3]{4x+5}$
2, $\left\{\begin{matrix} x^{2}-3x=(y-2)(y+1) & & \\ (x+y)\sqrt{x^{2}-4x+5}+(x-2)\sqrt{x^{2}+y^{2}+2xy+1}=0& & \end{matrix}\right.$
3, $\left\{\begin{matrix} x^{2}+\frac{1}{x^{2}}+y^{2}+\frac{1}{y^{2}}=5 & & \\ (x^{2}-1)(y^{2}+1)\left [ (x+y)xy+x-y \right ]=x^{2}& & \end{matrix}\right.$
4, $\left\{\begin{matrix} 8(x+y)-3xy=2y^{2}+x^{2} & & \\ 4\sqrt{2-x}+\sqrt{3-y2}=2x^{2}-y^{2}+5& & \end{matrix}\right.$
5, $\left\{\begin{matrix} x^{2}+y^{2}-y=(2x+1)(y-1) & & \\ \sqrt{3x+8}-y=\frac{5}{x+y-12}& & \end{matrix}\right.$