Đáp án:
2B 3A 4B 5D 6B 7A
Giải thích các bước giải:
\(\begin{array}{l}
C2:\\
3x + 2 < 0 \to x < - \frac{2}{3}\\
\to B\\
C3:\\
2x + 3 < 0 \to x < - \frac{3}{2}\\
\to A\\
C4:\\
x - 2 < 0 \to x < 2\\
\to B\\
C5:\\
- 5x + 1 < 0 \to - 5x < - 1\\
\to x > \frac{1}{5} \to D\\
C6:\\
- 3x + 2 > 0 \to 2 > 3x\\
\to \frac{2}{3} > x \to B\\
C7:\\
- 2x - 3 > 0 \to - 2x > 3\\
\to x < - \frac{3}{2} \to A
\end{array}\)
