\(\Rightarrow\left\{{}\begin{matrix}x-1=1\\y-2=3\end{matrix}\right.\) hoặc \(\left\{{}\begin{matrix}x-1=3\\y-2=1\end{matrix}\right.\) hoặc \(\left\{{}\begin{matrix}x-1=-3\\y-2=-1\end{matrix}\right.\) hoặc \(\left\{{}\begin{matrix}x-1=-1\\y-2=-3\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}x=2\\y=5\end{matrix}\right.\) hoặc \(\left\{{}\begin{matrix}x=4\\y=3\end{matrix}\right.\) hoặc \(\left\{{}\begin{matrix}x=-2\\y=1\end{matrix}\right.\) hoặc \(\left\{{}\begin{matrix}x=0\\y=-1\end{matrix}\right.\)
