第6章 6.2

(1)

$A \cap B = \{2,8\}$

(2)

$A \cup B = \{1,2,4,5,8\}$

(3)

$\overline{A} = \{1,3,4,6,7,9\}$

(4)

$\overline{B} = \{3,5,6,7,9\}$

$A \cap \overline{B} = \{5\}$

(5)

$A \cup \overline{B} = \{2,3,5,6,7,8,9\}$

(6)

$\overline{A \cup B} = \{3,6,7,9\}$