问题
选择题
设集合A={1,3,4,5},B={2,3,4},C={1,2},则集合(A∩B)∪C等于( )
A.{2}
B.{1,2}
C.{1,2,3,4}
D.{1,2,3,4,5}
答案
(A∩B)∪C
=({1,3,4,5}∩{2,3,4})∪{1,2}
={3,4}∪{1,2}={1,2,3,4}
故选C
设集合A={1,3,4,5},B={2,3,4},C={1,2},则集合(A∩B)∪C等于( )
A.{2}
B.{1,2}
C.{1,2,3,4}
D.{1,2,3,4,5}
(A∩B)∪C
=({1,3,4,5}∩{2,3,4})∪{1,2}
={3,4}∪{1,2}={1,2,3,4}
故选C