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}
问题描述:
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}
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.