\(a.\left|x+1\right|>2\)
\(\Rightarrow\left[{}\begin{matrix}x+1>2\\x+1< 2\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x>1\\x< 1\end{matrix}\right.\)
Vậy x>1 hoặc x<1
\(b.0\le\left|x-2\right|< 3\)
\(\Rightarrow\left[{}\begin{matrix}\left|x-2\right|\ge0\\\left|x-2\right|< 3\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x-2=0\\x-2>0\\x-2< 3\\x-2>3\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=2\\x>2\\x< 5\\x>5\end{matrix}\right.\)
Vậy.........
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