【题文】设U="{1,2,3,4,5}," A="{1,2,3}," B="{2,4}," 则A∪ =     

【题文】设U="{1,2,3,4,5}," A="{1,2,3}," B="{2,4}," 则A∪ =     

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【题文】设U="{1,2,3,4,5}," A="{1,2,3}," B="{2,4}," 则A        
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【答案】
解析
【解析】略
举一反三
【题文】
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【题文】设集合,则
A.B.
C.D.
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【题文】
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【题文】设集合,则
A.B.
C.D.
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【题文】已知全集U={1,2,3,4,5,6,7,8},M ={1,3,5,7},N ={5,6,7},则(CUM)∩ ( CUN)="                                           " (  )
A.{5,7}B.{2,4}C.{2,4,8}D.{1,3,5,6,8}
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