1 . 判断正误(正确的填“正确”,错误的填“错误”)
(1)
的元素个数等于集合A中元素的个数与集合B中元素个数的和.( )
(2)并集定义中的“或”能改为“和”.( )
(3)交集的元素个数一定比任何一个集合的元素个数都少.( )
(4)若
,则必有
.( )
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3744e71abf4b43e128eabea9181b712.png)
(2)并集定义中的“或”能改为“和”.
(3)交集的元素个数一定比任何一个集合的元素个数都少.
(4)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d743bda49fa8f4000d25e8f82e6a1cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64afdc6fcdc4cd326bb11679766c223e.png)
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2 . 已知
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5dbc2620601eb5d96543aee449a02e.png)
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd2e1862700d77b555e4ac0e4770425e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/075d564f3e2670b352f9bf33e702091c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5dbc2620601eb5d96543aee449a02e.png)
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3 . 已知集合
,
,则
.( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1c0d238aac41d512db9ac5c8c1f32cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fbe54aff76d3c1e04138dc96082ecbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5209b4ae943b34931b328d1feb91dd3.png)
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解题方法
4 . 已知全集
,集合
,
,则
. ( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07ff52d97910b1ba0dda2e67bc5f7625.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48bfdfd1a175a860a18587e4c21e04da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02a93031e4fafab7d1e77a04f5f45d2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be417400619e7d206dfe01b93b152a02.png)
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5 . 如果
,则
或![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cf1e97de471ad174a6e9d4c41dafabc.png)
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dea9a4259cca10c1f5af28e621ebafd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a347e53d69e6279105061e656d2f5bc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cf1e97de471ad174a6e9d4c41dafabc.png)
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