Giải thích các bước giải:
Ta có:
\(\begin{array}{l}
a,\\
A \cap B = \left\{ {x \in R|2 \le x \le 7} \right\}\\
A \cup B = \left\{ {x \in R} \right\}\\
A\backslash B = \left\{ {x \in R|x > 7} \right\}\\
B\backslash A = \left\{ {x \in R|x < 2} \right\}\\
b,\\
A \cap B = \left\{ {x \in R|x < 2} \right\}\\
A \cup B = \left\{ {x \in R|x \le 7} \right\}\\
A\backslash B = \left\{ \emptyset \right\}\\
B\backslash A = \left\{ {x \in R|2 \le x \le 7} \right\}\\
c,\\
A \cap B = \left\{ {x \in R|0 < x \le 2} \right\}\\
A \cup B = \left\{ {x \in R| - 1 < x \le 7} \right\}\\
A\backslash B = \left\{ {x \in R| - 1 < x \le 0} \right\}\\
B\backslash A = \left\{ {x \in R|2 < x \le 7} \right\}\\
d,\\
A = \left\{ {x \in N| - 8 < x < 12} \right\}\\
B = \left\{ {x \in R| - 3 < x < 3} \right\}\\
A \cap B = \left\{ {x \in N| - 3 < x < 3} \right\}\\
A \cup B = \left\{ {x \in R| - 8 < x < 12} \right\}\\
A\backslash B = \left\{ {x \in N| - 8 < x \le 3;\,\,3 \le x < 12} \right\}\\
B\backslash A = \left\{ \emptyset \right\}
\end{array}\)
