问题 解答题

设U={1,2,3,4,5,6,7,8},A={3,4,5},B={4,7,8}.求:

(1)∁UA

(2)∁UB

(3)∁UA∩∁UB.

答案

由U={1,2,3,4,5,6,7,8},A={3,4,5},B={4,7,8}.

所以(1)∁UA={1,2,6,7,8};

(2)∁UB={1,2,3,5,6};

(3)∁UA∩∁UB={1,2,6,7,8}∩{1,2,3,5,6}={1,2,6}.

单项选择题
单项选择题