真题
1 . (I)设
是各项均不为零的等差数列
,且公差
,若将此数列删去某一项得到的数列(按原来的顺序)是等比数列:
①当
时,求
的数值;②求
的所有可能值;
(II)求证:对于一个给定的正整数
,存在一个各项及公差都不为零的等差数列
,其中任意三项(按原来的顺序)都不能组成等比数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dce7746324fc2d823645ef0ebdd19753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f3320bf6ba9b10224ed7a92812a2d68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/812be9806122241c476ba1db516c4823.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fac3649308b528fd56545ba102dc42d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09e151e8083936ff799a0f27c54704d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(II)求证:对于一个给定的正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f3320bf6ba9b10224ed7a92812a2d68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/637d98ce2f46f04be14f081729292fda.png)
您最近一年使用:0次
2019-01-30更新
|
806次组卷
|
3卷引用:沪教版(上海) 高三年级 新高考辅导与训练 第四章 数列与数学归纳法 二、数列的其他问题
名校
2 . 对于项数为
(
)的有穷正整数数列
,记
(
),即
为
中的最大值,称数列
为数列
的“创新数列”.比如
的“创新数列”为
.
(1)若数列
的“创新数列”
为1,2,3,4,4,写出所有可能的数列
;
(2)设数列
为数列
的“创新数列”,满足
(
),求证:
(
);
(3)设数列
为数列
的“创新数列”,数列
中的项互不相等且所有项的和等于所有项的积,求出所有的数列
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e34f42b3be15518c29e3689c9fe6d6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66ad15dfc560ea83b94df4f81f43ebf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/131f3b6326e48c356b6d4a3901bcadef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/233427826eb2233641fc3a9805f6d206.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb4f58ba5bcf724190d4b7164ff85aca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f1ce1d77a0a00432fccf2a0b3b85dc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/522bc03934ea5b3acadc4c02398c2d24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84bff444d5f349081b27e76a2f4f9dfc.png)
(1)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f1ce1d77a0a00432fccf2a0b3b85dc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f1ce1d77a0a00432fccf2a0b3b85dc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e34bb06f9f1f2f4a23a45da3fd0ad2a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/131f3b6326e48c356b6d4a3901bcadef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc631d51fcb8adfef863d79c7af51098.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/131f3b6326e48c356b6d4a3901bcadef.png)
(3)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f1ce1d77a0a00432fccf2a0b3b85dc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f1ce1d77a0a00432fccf2a0b3b85dc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
您最近一年使用:0次
2018-04-02更新
|
713次组卷
|
6卷引用:北京市城六区2018届高三一模理科数学解答题分类汇编之压轴创新题
北京市城六区2018届高三一模理科数学解答题分类汇编之压轴创新题(已下线)4.3数列的概念与性质(第1课时)(作业)(夯实基础+能力提升)-【教材配套课件+作业】2022-2023学年高二数学精品教学课件(沪教版2020选择性必修第一册)石景山区2018年高三理科数学统一测试(一模)上海市吴淞中学2018-2019学年高二上学期期末数学试题(已下线)上海市华东师范大学第二附属中学2019-2020学年高二上学期10月月考数学试题北京市顺义区第二中学2022届高三适应性测试数学试题
解题方法
3 . 在①
,②
,③
这三个条件中任选一个,补充在下面问题中.若问题中的正整数
存在,求
的值;若不存在,说明理由.
设正数等比数列
的前
项和为
,
是等差数列,__________,
,
,
,是否存在正整数
,使得
成立?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fbb204190d79dabeaa6ea882d6113f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e11252e0fd5cb3df7166da71a3b64f20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35a9d42faa856c4ffb1b40edaa72962f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
设正数等比数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.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/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d30e94689c4871fc03262535d4298d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed9a8fb948910f3fab756e6af9f4bc9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffc44a339db90148813de4f7cf28d2c5.png)
您最近一年使用:0次
名校
4 . 已知正项数列
的前
项和为
,对任意
且
.
(1)证明:数列
为等差数列,并求数列
的通项公式;
(2)若
,求数列
的前
项和为
.
![](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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc8baf05f1ac4d7570d3f1f78b9258ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1dfe5b322577f02fd19caab8cf20170.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/216876de04325fd250c38c485cbc34b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
名校
解题方法
5 . 已知数列
为等比数列,
公比为q,且
,
为数列
的前
项和.
(1)若
求
;
(2)若调换
的顺序后能构成一个等差数列,求
的所有可能值;
(3)是否存在正常数
,使得对任意正整数
,不等式
总成立?若存在,求出
的范围,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b14f5fdf0e4f9de36f08402dd96d237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45482d31d1d7448c9f3922b4d2a55331.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09e3ab8dd752f8680d384270f470549b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a358586310926c6ac0a65a9076d1ecc.png)
(2)若调换
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c14d9ae06f864498048d55088ff4e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
(3)是否存在正常数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3b086f58f1aca9eae6626d4df844114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e78758feae95093c48b363927d94a67f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
您最近一年使用:0次
2017-12-26更新
|
682次组卷
|
6卷引用:2018年高考二轮复习测试专项【苏教版】专题五 数列
(已下线)2018年高考二轮复习测试专项【苏教版】专题五 数列(已下线)《2018届优等生百日闯关系列》【江苏版】专题二 第五关 以子数列或生成数列为背景的解答题(已下线)专题17 数列(模拟练)江苏省启东中学2018届高三上学期第二次月考数学试题江西省宜春市樟树中学2017-2018学年高一下学期第三次月考数学(理)试题上海市交大附中2019届高三高考一模试卷数学试题
名校
6 . (1)在等差数列
和等比数列
中,
,是否存在正整数
,使得数列
的所有项都在数列
中,若存在,求出所有的
,若不存在,说明理由;
(2)已知当
时,有
,根据此信息,若对任意
,都有
,求
的值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f329b217e1051b23f0d61023cdc6e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf82c1e9501358a78d5dde6f32fd2d8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f329b217e1051b23f0d61023cdc6e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)已知当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358b212c1a075d80c221c0df5b72c8d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f7a1e39dc65e132fa83c02cd0d91168.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358b212c1a075d80c221c0df5b72c8d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31ef8f0a683e12d585877db46d28933b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e35eeaabd951fb09b2926807da3685b.png)
您最近一年使用:0次
7 . 数列
中,已知
对任意
都成立,数列
的前
项和为
.(这里
均为实数)
(1)若
是等差数列,求
的值;
(2)若
,求
;
(3)是否存在实数
,使数列
是公比不为
的等比数列,且任意相邻三项
按某顺序排列后成等差数列?若存在,求出所有
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7acff98078cdd32804d8f1c4efbe2ddd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.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/d69991030d802192aff4af523d5bcf7e.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed160984f6a266078c412e00cee150dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(3)是否存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7a2ef115b3e4d764e54e8b29e33b036.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
您最近一年使用:0次
2014·江苏南京·一模
名校
8 . 设等差数列
的前
项和为
,已知
,
.
(1)求
;
(2)若从
中抽取一个公比为
的等比数列
,其中
,且
,
.
①当
取最小值时,求
的通项公式;
②若关于
的不等式
有解,试求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d737c1047a14cee12a6671383e244fa5.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/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e36ce33a999eae1d1ed722ccb6b33494.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)若从
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d737c1047a14cee12a6671383e244fa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1af9a5be517e9e01f1664dca2b3dd4cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eaa992a449b828df0ff545e233b279b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96e85fd7133dcb471c6e510636471b74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/496b876f40a7f8db613ff08b12a0da5c.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83fc39b516cab7ca482daa3d507d125d.png)
②若关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29163585ff608d7f55d64fce84164bcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8938120b44c040540af165bf3f050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
您最近一年使用:0次
2018高三上·全国·专题练习
9 . 设
,
,
,
是各项为正数且公差为
的等差数列.
(1)证明:
,
,
,
依次构成等比数列;
(2)是否存在
,
,使得
,
,
,
依次构成等比数列?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2398f658821ecd05f7cb1c6a286fda0f.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6b6a9b5399442dba8e7171549b35a5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f15e5a849ad616b7e37ec4386c97015e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/847bcec99eedd4c80698cfb2f997e890.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/523c1a680a57e30fb58adbabdf0aa22b.png)
(2)是否存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
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