ĐKXĐ:
a/ \(\left\{{}\begin{matrix}2-x\ge0\\x+2>0\end{matrix}\right.\) \(\Rightarrow-2< x\le2\)
b/ \(\left\{{}\begin{matrix}x+3\ge0\\x^2-3x+2\ge0\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}x\ge-3\\\left[{}\begin{matrix}x\ge2\\x\le1\end{matrix}\right.\end{matrix}\right.\) \(\Rightarrow\left[{}\begin{matrix}x\ge2\\-3\le x\le1\end{matrix}\right.\)