数学选择题？

Question

已知全集A=｛0,2,3,4,5,7｝,B=｛1,2,3,4,6｝,C=｛5,9｝,则(A∩B)∪C= A.｛2,3,4｝B.｛0,5,7｝C.｛0,1,2,4,9｝D.｛2,3,4,5,9｝

Answer 1

已知全集A=｛0,2,3,4,5,7｝,B=｛1,2,3,4,6｝,C=｛5,9｝,则(A∩B)∪C= A.｛2,3,4｝B.｛0,5,7｝C.｛0,1,2,4,9｝D.｛2,3,4,5,9｝
A∩B=｛2,3,4｝
(A∩B)∪C ={2,3,4} U ｛5,9｝={2,3,4,5,9}

Answer 2

a和b的交集是2 3 4，c是5 9，那么a交b再并上c就是2 3 4 5 9，建议复习一下交集并集的概念

Answer 3

A∩B=｛0,2,3,4,5,7｝∩｛1,2,3,4,6｝={2,3,4}
(A∩B)∪C ={2,3,4} U ｛5,9｝={2,3,4,5,9}
ans : D

Answer 4

答案选D
A∩B=｛2，3，4｝
然后∪C=｛2，3，4，5，9｝

Answer 5

A∩B={2，3，4}，
(A∩B)∪C={2，3，4，5，9}
对照答案，选择D