设集合A={a,b},且A∪B={a,b,c},那么满足条件的集合B共有( )A.1B.2C.3D.4
题型:单选题难度:一般来源:黄埔区一模
设集合A={a,b},且A∪B={a,b,c},那么满足条件的集合B共有( ) |
答案
∵A={a,b},且A∪B={a,b,c}, ∴B可能为{c}或{a,c}或{b,c}或{a,b,c}, 则满足条件的集合B共有4个. 故选D |
举一反三
设集合M={1,2},则满足条件M∪N={1,2,3,4}的集合N的个数是______. |
集合U={0,1,2,3,4},M={0,3,4},N={1,2,3},则CUM∩N=( )A.{0,1,2,3,4} | B.{1,2,3} | C.{1,2} | D.{3} |
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如果全集U=R,A={x|2<x≤4},B={3,4},则A∩(C∪B)( )A.(2,3)∪(3,4) | B.(2,4) | C.(2,3)∪(3,4] | D.(2,4] |
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设U={0,1,2,3,4},A={0,1,2,3},B={2,3,4},则(CUA)∪(CUB)=______. |
设集合A={5,(a+1)},集合B={a,b}.若A∩B={2},则A∪B=______. |
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