Để B \(\le\) 0 => \(\left[{}\begin{matrix}\left\{{}\begin{matrix}x+2\le0\\3-x>0\end{matrix}\right.\\\left\{{}\begin{matrix}x+2\ge0\\3-x< 0\end{matrix}\right.\end{matrix}\right.\)

=> \(\left[{}\begin{matrix}\left\{{}\begin{matrix}x\le-2\\x< 3\end{matrix}\right.\\\left\{{}\begin{matrix}x\ge-2\\x>3\end{matrix}\right.\end{matrix}\right.\)

=> \(\left[{}\begin{matrix}x\le-2\\x>3\end{matrix}\right.\)

Đề bài????//////

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