ĐKXĐ: \(\left\{{}\begin{matrix}-2x+3m+2\ge0\\x+2m-4\ne0\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x\le\frac{3m+2}{2}\\x\ne-2m+4\end{matrix}\right.\)
Để hàm số xác định trên \(\left(-\infty;-2\right)\)
\(\Leftrightarrow\left\{{}\begin{matrix}\frac{3m+2}{2}\ge-2\\-2m+4\ge-2\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}m\ge-2\\m\le3\end{matrix}\right.\)
\(\Rightarrow-2\le m\le3\)