已知集合U={1,2,3,4,5,6,7},A={2,4,5,7},B={3,4,5},则(∁UA)∪(∁UB)=( )A.{1,6}B.{4,5}C.{2,
题型:单选题难度:简单来源:重庆
已知集合U={1,2,3,4,5,6,7},A={2,4,5,7},B={3,4,5},则(∁UA)∪(∁UB)=( )A.{1,6} | B.{4,5} | C.{2,3,4,5,7} | D.{1,2,3,6,7} |
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答案
已知集合U={1,2,3,4,5,6,7},A={2,4,5,7},B={3,4,5}, CUA={1,3,6},CUB={1,2,6,7},则(CUA)∪(CUB)={1,2,3,6,7}, 故选D. |
举一反三
已知全集U=R,集合A={x|-1≤x≤3},集合B={x|log2(x-2)<1},则A∩∁UB=______. |
已知集合M={x|x<1},N={x|3x<1},则M∩N等于( )A.ϕ | B.{x|x<0} | C.{x|x<1} | D.{x|0<x<1} |
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已知全集U=R,M={x|x<0或x>1},N={x|<0},则( )A.M∪N=R | B.M∩N=∅ | C.∁UN=M | D.∁UN⊊M |
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已知函数f(x)=的定义域为M,g(x)=ln(1+x)的定义域为N,则M∩N=( )A.{x|x>-1} | B.{x|x<1} | C.{x|-1<x<1} | D.∅ |
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已知U=R,A={x|x>0},B={x|x≤-1},则(A∩∁UB)∪(B∩∁UA)=( )A.∅ | B.{x|x≤0} | C.{x|x>-1} | D.{x|x>0或x≤-1} |
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