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}.