1 . 设n为不小于3的正整数,在正n边形中,选取一些对角线,满足其中的任两条对角线若在多边形内部相交则一定垂直.问:最多可选取多少条对角线?
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2 . 对于数列
,若存在常数
使得
对任意正整数
成立,则称
是有界数列.已知数列
满足递推式
,求证:
(1)若
,则
不是有界数列.
(2)若
,则
是有界数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2480f87a11c4cd450bc9454ea7276722.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fbb510a00c96650e85fa03afed69d85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32bcb64530e6818698cc3d83c87a93c1.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13a6e1d671215fc96e4bee3541d1096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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3 . 设
,以
表示正整数b,c的最小公倍数.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27234e2e7b22e5c1bdd8a7a221d9d7dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e682f89425146ac9cb16b2f13a014c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9197cd1f45fdd9415fc4e2d65915ddcd.png)
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4 . 求最小的正整数
,使得存在一个
的数阵满足如下条件: (1)每一个数均属于集合
; (2)记
为数阵中第
行中的数组成的集合,
为第
列中的数组成的集合
,则
,
是4026个不同的集合.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5311a22867a26d56314456b295cc0d9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d878c148fbe54dd59228fbf86eeb80ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f95e54a9b7c66c97dc6ee6161a25c0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/407f2faadb10cd787d49783b06a32462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7600d2cfbdc6146db96cc545706004f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9238f5a421fdf8ba4c8a1a6642d50c93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81c273738a6cf6d268972acf713ca617.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9446a03ba0ba93f26ed79ab43cf3dbd8.png)
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5 . 在一次数学会议上,任意两位数学家要么是朋友,要么是陌生人.在进餐期间,每位数学家在两个大餐厅中的其中一个就餐,每位数学家所在的餐厅中包含偶数个他(或她)的朋友.证明:数学家能被分到两个餐厅中的不同分法的数目是2的正整数次幂(即形如
,其中,
是某个正整数).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98aa5f1acb67ec4580d240c2525e4d5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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6 . 将一枚棋子放在一个
的棋盘上,记
为从左、上数第
行第
列的小方格,求所有的四元数组
,使得从
出发,经过每个小方格恰一次到达
(每步为将棋子从一个小方格移到与之有共同边的另一个小方格).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2f92a1ac461e9b71247cd59e12cb2d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb4d5ca4e251ff0e503a26f9a7375326.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7600d2cfbdc6146db96cc545706004f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c969c72b1466caaa73129f2ee968af3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3044d760ef9d263537c142478ac35c19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85f88bcbc7c997bd3f56170ce4c997c8.png)
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7 . 已知数列
满足
,
.给定奇质数
和正整数
满足
,证明:
的充分必要条件为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e976c0663fa749ca749f99842d21ca03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/909736dad505d81be43aef91e6309bf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5108053cdc0b7d5d1813bbf96689ae5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c226ece1d984f7733996dbe669b6875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6f95f1bdd88065ccc93d4f6410b9f3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/580fd18d9d137cf66ed9c24b91f6463c.png)
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8 . 设
为互不相等的正整数,它们的最小公倍数为
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f2b043b989216035c6fd985f1dd6a3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/525e5ce4e91a4738e90809b1b949d6df.png)
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9 . 对给定的正整数
,定义
表示
的各个数位上的数字之和的平方,当
且
时,
表示
的各个数位上的数字之和的
次方,其中,当
为奇数时,
;当
为偶数时,
,试求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1580d1acb1ef184208d8a49694398cab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10e468312d09c6563c9094b710a35a65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac69e6db1df13ed64756b4f391ae9fac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1622aec09c560184b0d253a7f53bf1bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66e90a6d7b5f61955a1d963892fc7bf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a135cb036833400f3fa1edc92d5ce410.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba3301f1a7b308916e5de17c38ebf1c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029698978fcc20c10240e1dbcc1ec37b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0030cefcfe3ce06aa02e80c4e2b351.png)
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