已知全集为U,A={1,3,6,7},CUA={2,4,5,8,9},CUB={4,6,9}. 求: (1)全集U; (2)集合B; (3)CU(A∩B).
问题描述:
已知全集为U,A={1,3,6,7},CUA={2,4,5,8,9},CUB={4,6,9}.
求:
(1)全集U;
(2)集合B;
(3)CU(A∩B).
答
(1)∵A={1,3,6,7},CUA={2,4,5,8,9},A∪CUA=U∴U={1,2,3,4,5,6,7,8,9}(2)∵U={1,2,3,4,5,6,7,8,9},CUB={4,6,9}.∴B={1,2,3,5,7,8}(3)∵A={1,3,6,7},B={1,2,3,5,7,8...