ĐKXĐ: \(\left\{{}\begin{matrix}x-m+2\ge0\\x-m+2\ne1\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x\ge m-2\\x\ne m-1\end{matrix}\right.\)
Để hàm xác định trên khoảng đã cho:
\(\Leftrightarrow\left\{{}\begin{matrix}m-2\le0\\\left[{}\begin{matrix}m-1\le0\\m-1\ge1\end{matrix}\right.\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}m\le2\\\left[{}\begin{matrix}m\le1\\m\ge2\end{matrix}\right.\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}m=2\\m\le1\end{matrix}\right.\)
