Đáp án:
Giải thích các bước giải:
\(\begin{array}{l}
c.\left\{ \begin{array}{l}
x \le \frac{5}{3}\\
x \ge \frac{{ - 3}}{2}\\
x \ge - 1
\end{array} \right. \to \frac{5}{3} \ge x \ge - 1\\
e.\left\{ \begin{array}{l}
x - 1 \le 2\\
x - 1 \ge - 2\\
2x - 4 > 9 - 15x
\end{array} \right. \to \left\{ \begin{array}{l}
x \le 3\\
x \ge - 1\\
x > \frac{{13}}{{17}}
\end{array} \right. \to \frac{{13}}{{17}} < x \le 3\\
f.\left\{ \begin{array}{l}
x < 7\\
0 < 4x + 4
\end{array} \right. \to \left\{ \begin{array}{l}
x < 7\\
- 1 < x
\end{array} \right. \to \left\{ { - 1 < x < 7} \right.
\end{array}\)