1.$\left\{\begin{matrix} 3x^{3}-y^{3}=\frac{1}{x+y} & & \\ x^{2}+y^{2}=1 & & \end{matrix}\right.$
2.$\left\{\begin{matrix} x^{2}+y^{2}+\frac{8xy}{x+y}=16 & & \\ \frac{x^{2}}{8y}+\frac{2x}{3}=\sqrt{\frac{x^{3}}{3y}+\frac{x^{2}}{4}}-\frac{y}{2}& & \end{matrix}\right.$
3.$\left\{\begin{matrix} (2x^{2}-3x+4)(2y^{2}-3y+4)=18 & & \\ x^{2}+y^{2}+xy -7x-6y +14=0 & \end{matrix}\right.$
4.$\left\{\begin{matrix} \sqrt{\frac{x^{2}+y^{2}}{2}}+\sqrt{\frac{x^{2}+y^{2}+xy}{3}}=x+y & & \\ x\sqrt{2xy+5x+3}=4xy-5x-3 & & \end{matrix}\right.$
5.$\left\{\begin{matrix} x+y=0 & & \\ y+\frac{y}{\sqrt{x^{2}-1}}+\frac{35}{12}=0 & & \end{matrix}\right.$
6.$\left\{\begin{matrix} x+y=0 & & \\ 2(x^{2}+y^{2})+\frac{1}{2\sqrt{(1+x)(1+y)}}=1+\sqrt{x}(x+y) & & \end{matrix}\right.$