Đáp án:
$\begin{array}{l}
A = \left\{ {x \in R/ - 3 \le x < 5} \right\} \Rightarrow A = \left\{ { - 3; - 2; - 1;0;1;2;3;4} \right\}\\
B = \left\{ {x \in R/x \le 3} \right\} \Rightarrow B = \left( { - \infty ;3} \right]\\
C = \left\{ {x \in R/\left| {x - 1} \right| \ge 2} \right\}\\
\left| {x - 1} \right| \ge 2\\
\Rightarrow \left[ \begin{array}{l}
x - 1 \ge 2\\
x - 1 \le - 2
\end{array} \right. \Rightarrow \left[ \begin{array}{l}
x \ge 3\\
x \le - 1
\end{array} \right. \Rightarrow C = \left( { - \infty ; - 1} \right] \cup \left[ {3; + \infty } \right)
\end{array}$
