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)
题型:解答题难度:一般来源:江苏期中题
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) |
答案
解:(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} ∴A∩B={1,3,7} 而U={1,2,3,4,5,6,7,8,9}, ∴CU(A∩B)={2,4,5,8,9}. |
举一反三
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