如果集合A={1,2,3}B={3,4,5},那么A∪B等于( )
A. {1,2,3,4}
B. {1,3,4,5}
C. {1,3,4}
D. {1,2,3,4,5}
如果集合A={1,2,3}B={3,4,5},那么A∩B等于( )
A. {1,2,3,4}
B. {3}
C. {1,2,3,4,5}
D. {1,3,4,5}
1.如果集合U={1,2,3,4,5},A={3,4,5},则集合A的补集
A. {1,2,3}
B. {3,4,5}
C. {1,2}
D. {1,2,3,4,5}
A={4,5,6,8}, B={3,5,7,8},求A∪B.
A. {4,5,6,7}
B. {3,4,5,6,7,8}
C. {5,6,7}
D. {1,2,3,4,5}