已知集合 U ={1,2,3,4,5,6,7}, A ={2,4,5,7}, B ={3,4,5},则 =___
1个回答
解题思路:
∵
集合
U
=
{
1
,
2
,
3
,
4
,
5
,
6
,
7}
,
A
=
{
2
,
4
,
5
,
7}
,
B
=
{
3
,
4
,
5}
,
∴
,
∴
=
<>
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