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

 

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

 

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

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

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

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

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