1 . 已知
为正整数,数列
,记
.对于数列
,总有
,则称数列
为
项
数列.若数列
,均为
项
数列,定义数列
,其中
.
(1)已知数列
,求
的值;
(2)若数列
均为
项
数列,求证:
;
(3)对于任意给定的正整数
,是否存在
项
数列
,使得
,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/752fd51a1f77da353ce6b1f60a541484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf2db1d7b80adf8e2f9e1166e38d129.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a1e9876a6eb9cd53f9429c76582b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c1ee6963151926f01ffd3397588b1c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9685faad8329a30524372ce517ccafb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c1ee6963151926f01ffd3397588b1c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/393a788648e88082e87770cd08a232d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dffbbb6694b6e8c47f93cc16fdadf734.png)
(1)已知数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac989f284ebccffe400dc33abc0c4bd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dfefa1b4b591f44ed19304e74003744.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c1ee6963151926f01ffd3397588b1c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af68ff25db435cce5fe13c17c1b98395.png)
(3)对于任意给定的正整数
![](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/8c1ee6963151926f01ffd3397588b1c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b12c2f01a02302617a35c87aade849e.png)
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名校
解题方法
2 . 在数列
中,若存在非零整数T,使得
对于任意的正整数m均成立,那么称数列
为周期数列,其中T叫做数列
的周期,若数列
满足
,若
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ad71bbef310726e8799208cdacf358f.png)
,当数列
的周期最小时,该数列的前
项的和为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06a4e38ab612865c10b3f394d76c5d6a.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/e976c0663fa749ca749f99842d21ca03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/057a9b73fefcd70bd15bfa880c239f36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87a60302649eb940748da818199e55da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ad71bbef310726e8799208cdacf358f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87fea137ed54dc83086c686ef9d29abf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e976c0663fa749ca749f99842d21ca03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e946baf1316ac1f219398ecedadf6cf.png)
A.674 | B.675 | C.1347 | D.1349 |
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2卷引用:上海市南洋模范中学2023-2024学年高二上学期开学考数学试题
3 . 对于一个有穷正整数数列
,设其各项为
,各项和为
,集合
中元素的个数为
.
(1)写出所有满足
的数列
;
(2)对所有满足
的数列
,求
的最小值;
(3)对所有满足
的数列
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9304e71a623c4412188a800046a970d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943dc79f529bc28f6ed17bc403d50f06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61928f8c6293140637ad8ca24555f473.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f95dc7685d36aa3057e48caf0f53df22.png)
(1)写出所有满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e99ab9a4a0d517cf7138c6a78b481b2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
(2)对所有满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55bbebd71c677c2643a98d25c4c75184.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943dc79f529bc28f6ed17bc403d50f06.png)
(3)对所有满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011e8564732d55bcc518dba628d17718.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f95dc7685d36aa3057e48caf0f53df22.png)
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5卷引用:北京市第六十六中学2024届高三上学期第一次检测数学试题
北京市第六十六中学2024届高三上学期第一次检测数学试题北京市海淀区2023届高三上学期期末练习数学试题(已下线)北京市海淀区2023届高三上学期期末练习数学试题变式题16-21北京市西城区回民学校2024届高三上学期12月月考数学试题北京市西城区北师大附中2023-2024学年高二上学期期末数学试题
4 . 数列
依次为:1,
,
,
,
,
,
,
,
,
,
,
,
,
,
,
,
,
,…,其中第一项为
,接下来三项均为
,再接下来五项均为
,依此类推.记
的前
项和为
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3ffd5c35bba71ea54c28622b6cf505d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3ffd5c35bba71ea54c28622b6cf505d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3ffd5c35bba71ea54c28622b6cf505d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3ffd5c35bba71ea54c28622b6cf505d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3ffd5c35bba71ea54c28622b6cf505d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1985174e05ad371e13cf24d244423da4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1985174e05ad371e13cf24d244423da4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1985174e05ad371e13cf24d244423da4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1985174e05ad371e13cf24d244423da4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1985174e05ad371e13cf24d244423da4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1985174e05ad371e13cf24d244423da4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1985174e05ad371e13cf24d244423da4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/158b045c6172c4178d7aa52083e1489f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/158b045c6172c4178d7aa52083e1489f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5296c0056db0e2b5331c9b9a6d45962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3ffd5c35bba71ea54c28622b6cf505d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
A.![]() | B.存在正整数![]() ![]() |
C.![]() | D.数列![]() |
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7卷引用:湖北省武汉市部分学校2021-2022学年高三上学期9月起点质量检测数学试题
名校
解题方法
5 . 已知数列
满足
,若记数列
前
项和为
,则对于任意的
,
.
(1)求证:
是等比数列,并写出
的通项公式和其前
项和
的表达式;
(2)已知数列
满足
,
,设数列
的前
项和为
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29d5ec9ad92f37e64eccce922ab1b14e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f0073df06cf61eef7bd9dd2d069515e.png)
(1)求证:
![](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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
(2)已知数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/991b5d5d8eb00a21afa38a5b5f751178.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af1df2a8b51ea0efaaec4d6f96742e34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66dda996a671ca3b22474a96af1d37fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7057ffcf0b67d7e4f0b0bc21d829a70c.png)
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6 . 记数列{an}的前n项和为Sn,已知a1=1,Sn+1=4an+1.设bn=an+12an.
(1)证明:数列{bn}为等比数列;
(2)设cn=|bn100|,Tn为数列{cn}的前n项和,求T10.
(1)证明:数列{bn}为等比数列;
(2)设cn=|bn100|,Tn为数列{cn}的前n项和,求T10.
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5卷引用:广东省佛山市第四中学2023届高三下学期开学考试数学试题
7 . 意大利著名数学家斐波那契在研究兔子繁殖问题时,发现有这样一列数:1,1,2,3,5,…,其中从第三项起,每个数等于它前面两个数的和,后来人们把这样的一列数组成的数列
称为“斐波那契数列”,记
为数列
的前
项和,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2020-10-28更新
|
3372次组卷
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16卷引用:辽宁省六校2021-2022学年高三上学期期初联考数学试题
辽宁省六校2021-2022学年高三上学期期初联考数学试题湖北省六校2020-2021学年高三上学期10月联考数学试题江苏省苏州市张家港市外国语学校2020-2021学年高三上学期期中模拟测试数学试题广东省阳江市阳春市第一中学2020-2021学年高二上学期第三次月考数学试题广东省深圳市第二高级中学2020-2021学年高二上学期第二学段考试数学试题江苏省南通市海门中学2020-2021学年高三上学期10月月考数学试题江苏省南通市天星湖中学2020-2021学年高二上学期12月月考数学试题(已下线)专题5.1 数列基础(B卷提升篇)-2020-2021学年高二数学选择性必修第三册同步单元AB卷(新教材人教B版)(已下线)考点39 数列的综合应用-备战2021年高考数学经典小题考前必刷(新高考地区专用)(已下线)专题04 数列(数学思想与方法)-备战2022年高考数学二轮复习重难考点专项突破训练(全国通用)(已下线)专题3 数列的综合问题-学会解题之高三数学321训练体系【2022版】(已下线)考点15 数列综合问题-1-(核心考点讲与练)-2023年高考数学一轮复习核心考点讲与练(新高考专用)浙江大学附属中学丁兰校区2021-2022学年高二上学期期末数学试题(已下线)专题11 数列前n项和的求法 微点4 裂项相消法求和(二)(已下线)数列的综合应用(已下线)5.4数列的应用(分层练习,8大题型)-2023-2024学年高二数学同步精品课堂(人教B版2019选择性必修第三册)
解题方法
8 . 已知等比数列
的公比
,前
项和为
,且
,
.数列
满足
.
(1)求数列
、
的通项公式;
(2)求数列
的前
项的和;
(3)记
为区间
内整数的个数
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eda6dc559d07bc22c9a0ed1e3a6d01d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f28171b364c85b51806eddb2c210cc1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78e85d3bc21a3f9e2a81cd7a359df619.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0f6000421c5370e4b89f23be199f388.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bde034b0bb6767f923526db8a387c40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(3)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9e5dfcc28321b563a8012ec2899c502.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49d8308f4d32da07e0b4e161658f0cb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fe2e15ba11f38188ba4445117d0914f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4159b10615a3bafbf9f36e6f19fc99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e6f1af4b44b2e97e8f319bab4ae9010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cc1e7a87da7751da31f851ae6d46aff.png)
您最近一年使用:0次
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|
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3卷引用:湖北省新高考联考协作体2020-2021学年高二上学期开学联考数学试题
湖北省新高考联考协作体2020-2021学年高二上学期开学联考数学试题苏教版(2019) 选修第一册 选填专练 第4章 微专题十一 数列中常见求和问题(已下线)专题11 数列前n项和的求法 微点3 裂项相消法求和(一)
9 . 设数列
是首项为0的递增数列,函数
满足:对于任意的实数
,
总有两个不同的根,则
的通项公式是![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7535ab1819efecd58e89dbf65e1aa0ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0c91d6d2c9deb4722c6a7b21358b213.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfa2524fcaedaeb1a8b55df6d8c9bc37.png)
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20卷引用:2017届河南郑州一中网校高三入学测试数学(理)试卷
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10 . 若
或
,则称
为
和
的一个
位排列,对于
,将排列
记为
,将排列
记为
,依此类推,直至
,对于排列
和
,它们对应位置数字相同的个数减去对应位置数字不同的数,叫做
和
的相关值,记作
,例如
,则
,
,若
,则称
为最佳排列.
(Ⅰ)写出所有的最佳排列
.
(Ⅱ)证明:不存在最佳排列
.
(Ⅲ)若某个
(
是正整数)为最佳排列,求排列
中
的个数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3aa0f4cff7395ae1943c6624bedff15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/484227f07b23879a11207e1ce0c2a51e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cfeacc29e6a61c5b3b4e439c0a91df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cfeacc29e6a61c5b3b4e439c0a91df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69be4f6649db586cb61f27177a8e31b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9730694838cb4eac8aeac5613f722b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/375e799388a7380501b14e2b2a469e20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df487f36154ed93c8752b919ab500675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/418eb157282e922d3acf5488dcc5b49d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cfeacc29e6a61c5b3b4e439c0a91df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b80f28c33bb84e04861f08f064a0ff0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cfeacc29e6a61c5b3b4e439c0a91df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27676ab31f7b7fee04e6719275d7febf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae55b1aad1585aa5732d468f83a0483.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0746ade04116b44bc675d6bdb2075d76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfdcf0a95b4c1a2ad293fdec932994f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f97a1ee8a5a1bb710de04c38a3c79fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/519482116da1a328a9c16525c09ba4eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cfeacc29e6a61c5b3b4e439c0a91df.png)
(Ⅰ)写出所有的最佳排列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b56e44e4f0424a2b7a45567120a2e4.png)
(Ⅱ)证明:不存在最佳排列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5002f030017f6f0b34a61b2e15c5a9cb.png)
(Ⅲ)若某个
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d074c8ac48227c468fc562a34bfd93c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d074c8ac48227c468fc562a34bfd93c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
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