Đáp án:
$1.A = \left\{ {1;\frac{3}{2};3} \right\}\\$
$2.B = \left\{ {7;3;0;1; - 1} \right\}\\$
$3.C = \left\{ {1;\frac{1}{6}} \right\}\\$
$4.D = \left\{ {\frac{3}{2};1} \right\}\\$
Giải thích các bước giải:\[\begin{array}{l}
1.A = \left\{ {1;\frac{3}{2};3} \right\}\\
2.B = \left\{ {7;3;0;1; - 1} \right\}\\
3.C = \left\{ {1;\frac{1}{6}} \right\}\\
4.D = \left\{ {\frac{3}{2};1} \right\}\\
5.E = \left\{ {0;1} \right\}\\
\left\{ \begin{array}{l}
x + 3 < 4 + 2x\\
5x - 3 < 4x - 1
\end{array} \right. \Leftrightarrow \left\{ \begin{array}{l}
x > - 1\\
x < 2
\end{array} \right. \Leftrightarrow - 1 < x < 2\\
6.F = \left\{ { - 3; - 2; - 1} \right\}\\
- 1 \le x + 2 \le 1 \Leftrightarrow - 3 \le x \le - 1\\
7.G = \left\{ {0;1;2;3;4} \right\}\\
8.H = \left\{ \emptyset \right\}
\end{array}\]
