1 . 设
表示不超过实数
的最大整数.求集合
的元素个数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4f5908d6a1217e493ed7586b6964dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46710c6d9f6819102c2b75b9d28c99f8.png)
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2 . 集合
,若
,
为X中最大数与最小数的和(若集合X中只有一个元素,则此元素既为最大数,又为最小数),那么,对M的所有非空子集X,全部
的平均值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4636c9785d5afeb1bfceb8b8cce15423.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddede9ed5c97e5d434901398104b43e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2740fa13ab4f1221ab46b210c9294ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870f779b750b50f9be3ca0a071e6efae.png)
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3 . 集合
.试问:在集合A中,是否一定存在两个元素
,使不等式
成立?若存在,请给出证明;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d44c9e3eb7ca218e22bbe54a3bed69f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2e647c14561826ba9e396acc5a3792c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8790b249d490ff811e40accd98405293.png)
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2005高三·福建·竞赛
4 . 设S是集合
的一个非空子集.若正整数n满足:
,则称n是子集S的“模范数”,这里
表示集合S中元素的个数.对集合
的所有非空子集S,模范数的个数之和____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6dffa0ee6fa3e29966331890d3a0a82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0d1eeb3eefae670b04c7bf41ed77eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/911cdb689ca80557ce076cb49b3ee498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6dffa0ee6fa3e29966331890d3a0a82.png)
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5 . 设
求![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1336d38741aab2255a35c26612bbd7cc.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9404f94292a7272b77aa0a38807c485.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1336d38741aab2255a35c26612bbd7cc.png)
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6 . 已知集合
,且满足
中任何2个元素的和都不能被5整除.则集合
中元素的个数最多是( )个.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a03430ec52cc47ff26e4a65487f8c22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
A.10 | B.11 | C.12 | D.13 |
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2004高三·山东·竞赛
7 . 向量集合
.则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4ef7ea4cd077cb0415868c78016b7c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1336d38741aab2255a35c26612bbd7cc.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2004高三·河南·竞赛
8 . 已知函数
.
(1)设常数
,若
在区间.
到上是增函数,求
的取值范围;
(2)设集合
,
,若
,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b0e785a8e697a59064b665694e4fcd.png)
(1)设常数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4456675a5dbe545462a22cef9aca8fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89f22655f0f6b649b0600a1d2c75a590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4324210735686fb21351566abe8c77ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074c228ffc7b1e306f8410afe7bc4b5c.png)
(2)设集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43561e4e7c2f4c7ac87ac62664967d2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1885f569958e45aedb9be7eac1cc5db6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2ad78dc8b8aed907b4fe9640c997454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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2004高三·河南·竞赛
9 . 集合
,
.那么,集合
中所有元素的和等于_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f5a6ea0ef2234f6d261d64536b21922.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc4aafe1132428c7bfb1286511eec74e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e02a92f197fee1f7bf22ae673a9c1a9.png)
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10 . 集合
,
.
(1)若
,求实数
的取值范围;
(2)设点
,集合
所表示的两个平面区域的边界相交于点
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f0c85439ab7831192e839be44055589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71ed17fc894e8fcc547b9c161d669278.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96f1ba0a1129741502600e47bf058c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78e2b688b2e9419622fb80efab51169b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77684b3856f797403b2040c5dc73c2ce.png)
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