问题
选择题
已知U={1,2,3,4,5,6,7,8},A={1,3,5,7},B={2,4,5}则∁U(A∪B)( )
A.{6,8}
B.{5,7}
C.{4,6,7}
D.{1,3,5,6,8}
答案
∵U={1,2,3,4,5,6,7,8},A={1,3,5,7},B={2,4,5}
∴A∪B={1,2,3,4,5,7},
∴Cu(A∪B)={6,8}
故选A
已知U={1,2,3,4,5,6,7,8},A={1,3,5,7},B={2,4,5}则∁U(A∪B)( )
A.{6,8}
B.{5,7}
C.{4,6,7}
D.{1,3,5,6,8}
∵U={1,2,3,4,5,6,7,8},A={1,3,5,7},B={2,4,5}
∴A∪B={1,2,3,4,5,7},
∴Cu(A∪B)={6,8}
故选A