1,$\left\{\begin{matrix} 2(\frac{y+1}{x^3}+xy)+\frac{y^2+2y+7}x=(3x^2-2)\\2\sqrt{x-1}+3x\sqrt{-4-y}=x^2y+72 \end{matrix}\right.$
2,$\left\{\begin{matrix} x+y+6=2\sqrt{(2y-x)(x+4)}\\ 2(x\sqrt{5x-y+3}-5)=\frac{12(y-x)}{x^3+4}-\sqrt{y-4} \end{matrix}\right.$
3,$\left\{\begin{matrix} x^3-3y^3=x^2y+5xy^2\\ 2(\sqrt{3x}+\sqrt{2y-1})-7=11y+6\sqrt{y(x-y-1)} \end{matrix}\right.$
