Đáp án:
Giải thích các bước giải:
\(\begin{array}{l}
o.\left[ \begin{array}{l}
0 < x + 1 < 3\\
0 > x + 1 > - 3
\end{array} \right. \to \left[ \begin{array}{l}
- 1 < x < 2\\
- 1 > x > - 4
\end{array} \right.\\
p.\left[ \begin{array}{l}
0 < x < 3\\
0 > x > - 3
\end{array} \right.\\
q.\left[ \begin{array}{l}
- 3 < x + 1 < 3\\
3 > x + 1 > - 3
\end{array} \right.\\
\to 2 > x > - 4\\
r.\left[ \begin{array}{l}
- 2 < x - 5 < 0\\
2 > x - 5 > 0
\end{array} \right. \to \left[ \begin{array}{l}
3 < x < 5\\
7 > x > 5
\end{array} \right.
\end{array}\)
