1 . 证明:存在无穷多个棱长为正整数的长方体,其体积恰等于对角线长的平方,且该长方体的每一个表面总可以割并成两个整边正方形.
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2 . 正整数数列
满足:
,
.试求通项公式
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/527bd6adefbb15deb6ad829d7584d072.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/191d7c7739907a08a2bbf5c23b6b3386.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
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3 . 设
是定义在自然数集合
上并在
上取值的函数,满足:对任何两个不相等的自然数
,有
.
(1)求
;
(2)假设
是100个两两不相等的自然数,求
;
(3)是否存在符合题设条件的函数
,使
,证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/145b9b7961cf1f359862430bbca15465.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f74081cfd8d2457ff2d575d439f13b5.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e38fffbc7ab9882480f4faa72390e23.png)
(2)假设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc7c76c1ceb8cfc22b108c55565d2b61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/977b29dc3c945f0177201359056566d0.png)
(3)是否存在符合题设条件的函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/524ee808469860f15659f9353b3d647e.png)
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4 . 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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5 . 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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6 . 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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7 . 已知
,
.求证:对一切
,
,…,
,均有
,等号当且仅当
时成立.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be466586da8810ccfd811c59a747adb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf10e7b0809be29347785970158557fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a774356dc406f4f2c2b5295a65bee96f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e60c52127beaf19b211d27e3373192c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2697ef67790838c84cc238a0334c5d47.png)
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8 . 已知数列
满足:
,
,
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61f75723824158fae6941098197f51b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7d996de3c21f0fbec3750b1985fc6c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b871ed324a95d6c6daf03fda30feb9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d39d6aa1813347686313bc667026d52.png)
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9 . 求最小的正整数
,使得当正整数点
时,在前
个正整数构成的集合
中,对任意
总存在另一个数
且
,满足
为平方数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d2ba3c51d2726df8cee0918b8af2d32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcc6a0568db5a3fc7aca3366e608cf69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acfc595518cf752e1c7903dfff93dbda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7580ce638933a1c81da5e2e1b656c77a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7741c8d8f0486556a102d904fb26a7be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88584cf1df43e28d03592c7998b1653.png)
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