题目内容
已知U={1,2,3,4,5,6,7,8},A={3,4,5},B={1,3,6},则集合C={2,7,8}是( )
A.A∪B | B.A∩B | C.(∁UA)∩(∁UB) | D.(∁UA)∪(∁UB) |
∵U={1,2,3,4,5,6,7,8},A={3,4,5},B={1,3,6},
∴A∪B={1,3,4,5,6},A∩B={3},
∴∁U(A∪B)={2,7,8},∁U(A∩B)={1,2,4,5,7,8},
则(∁UA)∩(∁UB)=∁U(A∪B)={2,7,8},(∁UA)∪(∁UB)=∁U(A∩B)={1,2,4,5,7,8}.
故选C
∴A∪B={1,3,4,5,6},A∩B={3},
∴∁U(A∪B)={2,7,8},∁U(A∩B)={1,2,4,5,7,8},
则(∁UA)∩(∁UB)=∁U(A∪B)={2,7,8},(∁UA)∪(∁UB)=∁U(A∩B)={1,2,4,5,7,8}.
故选C
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