1 . 设
为正数,
为
的所有子集的任一个排列.求
的最大值,其中
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a84cb4d15071254b42985034c80cfea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94ea993dd2879ecfefc8d2f312825662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36678342dee60262409ca8288ae2568d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29de0fa2c2a429768cf8e015f5758ca6.png)
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2 . 设
是连续
个正整数组成的集合,求最小的正整数k,使得M的任何k元子集中都存在
个数
满足
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b80ac229d3f7e499678472babe45fbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e99f542cd1ca03e2b1ce460db7fb36c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0623207595425920f16e76a7f8f268b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbcf54ce905695c027f18ff254ed8d98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c0240713c6956a588d7cf4a3dfc3383.png)
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3 . 对两个不全等的矩形A、B,称
,若A的长不小于B的长,且A的宽也不小于B的宽.现在若对任意的n个两两不全等的,长和宽均为不超过2020的正整数的矩形,都必存在其中3个矩形A、B、C,使得
,求n的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca51be437b1a97ca92aa1159ab71102c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c1f322806f62922efbc8127b74cbbf0.png)
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4 . 已知
是一个有限集.
是满足如下性质的两个分划:若
,则
.求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b24e5de4a017b9f653155807cc3abbe1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40d663fdc392eec67c0731f5ed309cff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1274c93bc940c8f902a2dc142940b5bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37765d2927d24d4b582423c843aebcd4.png)
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5 . 设函数
满足对于每个
,均存在一个
,使得
,其中,
是f复合m次.设
是满足上述条件的k中的最小值,证明:数列
无界.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3df6c82d43d84c952ea65b9508306cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deffbcb0165f1a90a435d50118a14b68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/641314f7a1c387a45aac2ca9ee815150.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62eb22a7e6a88d836a0b6c97af0b30b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d1c48d12cf6f92ed5bbd15ac2668e0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bbbf4d763f3cbe5a71707bc19c78191.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e36f86937e11389c7b7a5012735bd788.png)
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