\(\begin{cases}2\sqrt{x^2+3x+2}-\sqrt{x+1}=2y\sqrt{y^2+1}+9-y-6y^2\\\sqrt{x^2+3x+2}+3\sqrt{x+1}=y\sqrt{y^2+1}-6+3y+4y^2\end{cases}\)
\(\begin{cases}x^2-y-1=2\sqrt{2x-1}\\y^3-8x^3+3y^2+4y-2x+2=0\end{cases}\)
\(\begin{cases}\left(x+\sqrt{x^2+4}\right)\left(y+\sqrt{y^2+1}\right)=2\\27x^6=x^3+4x+2\end{cases}\)
\(\begin{cases}x-\sqrt{3y-2}=\sqrt{9y^2-6y}-x\sqrt{x^2+2}\\x+y+\sqrt{y+3}=4\end{cases}\)