已知集合A={2,3,4,5,6},集合B={2,4,5,8,9},则A∩B=( )A.{2,3,4,5,6,8,9}B.{2,4,5}C.∅D.{2,3,4
题型:单选题难度:一般来源:不详
已知集合A={2,3,4,5,6},集合B={2,4,5,8,9},则A∩B=( )A.{2,3,4,5,6,8,9} | B.{2,4,5} | C.∅ | D.{2,3,4,5,6} |
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答案
因为集合A={2,3,4,5,6},集合B={2,4,5,8,9}, A∩B={2,3,4,5,6}∩{2,4,5,8,9}={2,4,5}. 故选B. |
举一反三
集合A={x|-1<x≤3},集合B={x|1<x<5},则A∪B=( )A.{x|-1<x<5} | B.{x|3<x<5} | C.{x|-1<x<1} | D.{x|1<x≤3} |
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设全集为R,集合A=(-1,5],则 CUA=( )A.(-∞,-1] | B.(5,+∞) | C.(-∞,-1)∪[5,+∞) | D.(-∞,-1]∪(5,+∞) |
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