名校
1 . 已知有限集合
,定义集合
中的元素个数为集合
的“容量”,记为
.若集合
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aacb0cef0b4732cd149dbf81db44835d.png)
__________ ;若集合
,且
,则正整数
的值是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb9e56ab45ddf991ae24983027e04b08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30502b549c09cd1094e061090e64e866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e20929ac73a0217b33cd41f6aa86cf29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ebc3da55cca67bac55ace85a5f4c556.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aacb0cef0b4732cd149dbf81db44835d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc0e7c8479f8f57d2b4d29dbab700753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6532556ff662731db6be89bee77a8b8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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名校
2 . 下列四个命题中正确的是( )
A.![]() | B.由实数![]() |
C.集合![]() | D.集合![]() |
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3 . 设集合
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de0865ceb3015ec1165e8c278ac67e52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c511e4c03e55e30a4e07f344ed2294df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e6fe9faa2552cdbd94e6f527354e71.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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