已知全集U={1,2,3,4,5,6,7,8},M={1,3,5,7},N={5,6,7},则Cu( M∪N)=( )A.{5,7}B.{2,4}C.{2,4
题型:单选题难度:简单来源:许昌模拟
已知全集U={1,2,3,4,5,6,7,8},M={1,3,5,7},N={5,6,7},则Cu( M∪N)=( )A.{5,7} | B.{2,4} | C.{2,4,8} | D.{1,2,3,4,6,7} |
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答案
∵M={1,3,5,7},N={5,6,7}, ∴M∪N={1,3,5,6,7}, ∵U={1,2,3,4,5,6,7,8}, ∴Cu( M∪N)={2.4.8} 故选C |
举一反三
已知A={x|x2-2x-3<0},B={x|<1},则A∩CRB=( )A.(-1,2) | B.(2,3) | C.[2,3) | D.(-1,3) |
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设全集为R,A={x|x<3或x>5},B={x|-3<x<3},则( )A.∁RA∪B=R | B.A∪∁RB=R | C.∁RA∪∁RB=R | D.A∪B=R |
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若M={x|x=in,n∈Z},N={x|>-1}(其中i为虚数单位),则M∩(CRN)=( )A.{-1,1} | B.{-1} | C.{-1,0} | D.{1} |
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设集合M={x|y=},N={y|y=x2,x∈R},则M∩N等于 ______ |
已知集合A={-1,0,1,5,8},B={x|x>1}则A∩B=( )A.{0,1,5,8} | B.{1,5,8} | C.{5,8} | D.A |
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