\(xy\left(x-2\right)\left(y-2\right)=4\)
\(\left(x^2-2x\right)y^2+\left(4x-2x^2\right)y=4\)
\(\Rightarrow\left(x^2-2x\right)y^2+\left(4x-2x^2\right)y-4=0\)
\(\left(x^2-2x\right)y^2+\left(-2x^2+4xy\right)y-4=0\)
\(\Rightarrow\left(x^2-2x\right)\left(y^2-2y\right)=4\)
\(\Rightarrow y\left(y-2\right)=\frac{4}{x-\left(x-2\right)}\)
\(\left(x-2\right)\ne0\)
\(\Leftrightarrow\orbr{y=\frac{x^2-\sqrt{x^4-4x^3+8x^2-8x-2x}}{x^2-2x}}\)
\(HPT\Leftrightarrow\hept{\begin{cases}\left[x\left(x-2\right)\right]\left[y\left(y-2\right)\right]=4\\x\left(x-2\right)+y\left(y-2\right)=4\end{cases}}\)
Đặt x(x-2) =a; y(y-2) = b..