已知全集U=A∪B={1,2,3,4,5,6,7},A∩(CUB)={2,4,6},则集合B=( )A.{2,4,6}B.{1,3,5}C.{1,3,5,7}
题型:单选题难度:简单来源:广州二模
已知全集U=A∪B={1,2,3,4,5,6,7},A∩(CUB)={2,4,6},则集合B=( )A.{2,4,6} | B.{1,3,5} | C.{1,3,5,7} | D.{1,2,3,4,5,6,7} |
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答案
根据A∩(CUB)={2,4,6}, 得到:{2,4,6}⊆A,且{2,4,6}⊆CUB, 即元素2,4,6∉B,又全集U=A∪B={1,2,3,4,5,6,7}, 则集合B={1,3,5,7}. 故选C. |
举一反三
设U=R,A={x|x>0},B={x|x2>1},则A∩(∁UB)=( )A.{x|0≤x<1} | B.{x|0<x≤1} | C.{x|x<0} | D.{x|x>1} |
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已知集合M={x|-1<x<2},N={y|y=-x2+1},则M∩N=( )A.{x|-1<x<1} | B.{x|-1<x≤1} | C.{x|-1<x<2} | D.∅ |
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已知集合A={x|x2-3x+2=0}. (1)如果集合B={x|mx+1=0},并且B⊆A,求m的值; (2)如果集合B={x|x2-2x+m=0},并且B∪A=A,试确定m的范围. |
已知集合M={x |
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设A={x|x2+px-8=0},B={x|x2-qx+r=0},且A≠B,A∪B={-2,4},A∩B={-2},求p、q、r的值. |