1.设U={1,2,3,4,5}, A={1,2,3}, B={2,4}, 则A∪ B = A.{1,2,3,4} B.{1,2,3,5} C.{2,3,4,5} D.{1,3,4,5} 【查看更多】

 

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设U={1,2,3,4,5}, A={1,2,3}, B={2,4}, 则A∪ =        

 

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设U={1,2,3,4,5}, A={1,2,3}, B={2,4}, 则A∪ =        

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设U={1,2,3,4,5}, A={1,2,3}, B={2,4}, 则A∪ =     ▲    .

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设U={1,2,3,4,5}, A={1,2,3}, B={2,4}, 则A∪ =     ▲    .

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

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