Giải thích các bước giải:
$\text{ a, |𝑥−2|<3}$
⇔ \(\left[ \begin{array}{l}x-2<3\\x-2>-3\end{array} \right.\)
⇔ \(\left[ \begin{array}{l}x<5\\x>-1\end{array} \right.\)
$\text{b, |𝑥+1|>2}$
⇔ \(\left[ \begin{array}{l}x+1>2\\x+1<-2\end{array} \right.\)
⇔ \(\left[ \begin{array}{l}x>1\\x<-3\end{array} \right.\)