已知集合U={1,2,3,4,5,6,7,8,9},A={4,5,6,7,8,9},B={1,2,3,4,5,6}.求A∪B; A∩B;

已知集合U={1,2,3,4,5,6,7,8,9},A={4,5,6,7,8,9},B={1,2,3,4,5,6}.求A∪B; A∩B;CU(A∩B).

∵A={4,5,6,7,8,9},B={1,2,3,4,5,6}.
∴A∩B={4,5,6}
A∪B={1,2,3,4,5,6,7,8,9},
已知集合U={1,2,3,4,5,6,7,8,9},
∴CU(A∩B)={1,2,3,7,8,9}.
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