\(\left(x-1;y+2\right)\in\left\{\left(1;11\right);\left(11;1\right);\left(-1;-11\right);\left(-11;-1\right)\right\}\)
hay \(\left(x,y\right)\in\left\{\left(2;9\right);\left(12;-1\right);\left(0;-13\right);\left(-10;-3\right)\right\}\)
\(=>x-1;y+2\inƯ\left(11\right)\)
\(=>\left\{{}\begin{matrix}x-1=11\\x-1=-11\\x-1=1\\x-1=-1\end{matrix}\right.=>\left\{{}\begin{matrix}x=12\\x=-10\\x=2\\x=0\end{matrix}\right.\)
\(\left\{{}\begin{matrix}y+2=11\\y+2=-11\\y+2=1\\y+2=-1\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}y=9\\y=-13\\y=-1\\y=-3\end{matrix}\right.\)
