设全集U={1,2,3,4,5,6,7},A={2,4,5,7},B={3,4,5},定义A*B={x∈U|x∉A或x∉B},则A*B等于( )
A. {1,6}
B. {4,5}
C. {1,2,3,6,7}
D. {2,3,4,5,7}
人气:323 ℃ 时间:2020-01-27 08:09:56
解答
因为定义A*B={x∈U|x∉A或x∉B},
又全集U={1,2,3,4,5,6,7},A={2,4,5,7},B={3,4,5},
所以A*B={1,2,3,6,7}.
故选:C.
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