设集合A={1,2,3,5,7},B={3,4,5},则A∪B=( )A.{1,2,3,4,5,7}B.{3,4,5}C.{5}D.{1,2}
题型:单选题难度:一般来源:不详
设集合A={1,2,3,5,7},B={3,4,5},则A∪B=( )A.{1,2,3,4,5,7} | B.{3,4,5} | C.{5} | D.{1,2} |
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答案
∵集合A={1,2,3,5,7},B={3,4,5}, ∴A∪B={1,2,3,4,5,7}, 故选A. |
举一反三
已知集合A={x|x>0},B={x|x<4},那么集合A∩B=( )A.φ | B.{x|x>0} | C.{x|x<4} | D.{x|0<x<4} |
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已知A、B均为集合U={2,4,6,8,10}的子集,且A∩B={4},(CUB)∩A={10},则A=______. |
设集合A={x|x2+4a=(a+4)x,a∈R},B={x|x2+4=5x}. (1)若A∩B=A,求实数a的值; (2)求A∪B,A∩B. |
设全集I={0,1,2,3,4},集合A={0,1,2,3},集合B={2,3,4},则(CIA)∪(CIB)等于A.{0} | B.{0,1} | C.{0,1,4} | D.{0,1,2,3,4} |
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设集合A={1,2},则满足A∪B={1,2,3,4}的集合B的个数是( ) |
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