1 . 已知
个实系数二次函数
的判别式
都相等.若对任意的
,方程
均有两个不等的实根,求证:方程
也有两个不等的实根.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac19e2a797cd0a408316988a63b3755.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c3533c86c4bbbe2d1e33d2333f11765.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02851e3945be42052e14025a7c7891ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/937c09d82c480e4d67f8a48d3f66c5f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98b78064fe7cc2d226064a48a307d47a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/013f1b26468c2d5c843658aee3072937.png)
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2 . 给定正整数
,对于正整数
,集合
.集族
满足如下条件:
(1)
的每个集合都是
的
元子集;
(2)
中的任意两个集合至多有一个公共元素;
(3)
的任意一个元素恰出现在
中的两个集合中.
试求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92ee628911994243c46467361fd30098.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/950b2b2d555ce0f0adbdb85a63b30778.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a279eed3fea6a07ffc2e7784b9dfcfd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a279eed3fea6a07ffc2e7784b9dfcfd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
试求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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3 . 求满足下列条件的最小正整数t,对于任何凸n边形
,只要
,就一定存在三点
,使
的面积不大于凸n边形
面积的
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd76ce38a05b798d45147dd2fe05294e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0166ef16246534081188fce28684b49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75245070263484fc737f7bacc16a807e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846c13953ba2a1c0a2113ad4c067ca78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd76ce38a05b798d45147dd2fe05294e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee6a2eba56d4f2d1670b0256b8d86b92.png)
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4 . 奥运会排球预选赛有
支球队参加,其中每两队比赛一场,每场比赛必决出胜负.如果其中有
支球队
满足:
胜
,
胜
,
胜
,
胜
,则称这
支球队组成一个“
阶连环套”.证明:若全部
支球队组成一个
阶连环套,则对于每个
及每支球队
,
必与另外某些球队组成一个
阶连环套.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a7d525e6722633e75b3a6a4bf5ae40d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc9d48660f696fc51b97c89fa55d6f4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b56e44e4f0424a2b7a45567120a2e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5e7f40329d8c7638ef765e7a415cbcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7f2c72ab559a0615db4c51327b78d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7f2c72ab559a0615db4c51327b78d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9e582fc4b293ce81d01e4106fbfb09f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e819b87f90651d89fcd258c276294e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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5 . 求证:存在唯一的正整数数列
,使得
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ddd6fc72d06ab0baec942bb06269263.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae831fee3e65238c0a1da5cb11ddca86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c859ed3085d0b8b22eb7c09bf61d1c70.png)
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6 . 设
是给定的正整数,
.记
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad89b2acebe155e869364acd8d464d77.png)
.证明:存在正整数
,使得
为一个整数,其中,
表示不小于实数
的最小整数(如
,
).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ee72bf6c307a2d83a30c65893ebe90b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f721367c14f3dd608be3cbfe750eeb8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad89b2acebe155e869364acd8d464d77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbcf152cc8102e3472504d02355acde6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2890e1cf994207875837def2ca3e1ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/898a6c355155c992f5e44bb86684225a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a3f52f0ecb7ce48378c464edf66c40d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31dbd410162b646ba0d5951fdb9cb0ea.png)
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7 . 将长为
、宽为
的矩形划分为
个小正方形.一粒子不重复不遗漏连续地通过每个小正方形的一条对角线.这件事能否办到?若办不到,请说明理由;若能办到,请给出一种行走路线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e70354d6ca5ad9f6b4592fac0b5e559.png)
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8 . 一个人上台阶可以一次上1级台阶,也可以一次上3级台阶,或者一次上4级台阶.若这个人上
级台阶总共有
种走法,证明
为平方数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2bfe05ef6780e5f032ca3a7c96811a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b07f7a46323e7630dd8cd5cffcb11a5d.png)
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9 . 求集合
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b96ab3cc4f183937d0ecf24feeff9508.png)
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10 . 设
,其中,b为正奇数.定义数列
满足
,
.若正整数
,使得
为素数.证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a29fca134ddbac482c9821e78e6ab842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1f83d1a6f169d2e621b366431729888.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91fc7b499561a3427ed1ef0354689f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/772e2d1d7398351c44c55366756f16ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53500b98cf6e4620e77a8271c73549d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76a3ac74cdb64183be40d576145a9cd5.png)
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