1 . 已知首项为
的等比数列
的前
项和为
,且
,
,
成等差数列.
(1)求数列
的通项公式;
(2)对于数列
,若存在一个区间
,均有
,则称
为数列
的“容值区间”.设
,试求数列
的“容值区间”长度的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.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/04e406b775bbaa0ae52dab5b7bd384a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb0b99a3e6cab1cde1bb575f2b228e8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a888492710e24e13dcf15448f43e8174.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)对于数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/621604766ddd141c86e37da5e71aef26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f144b23a6628703ef1b9546ecd418d16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/621604766ddd141c86e37da5e71aef26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b477cc2b249061d0eb6839114172b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
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2020-02-15更新
|
872次组卷
|
5卷引用:第5课时 课后 等比数列的前n项和
(已下线)第5课时 课后 等比数列的前n项和2020届湖南省长沙市雅礼中学高三第5次月考数学(文)试题2020届湖南省娄底市高三上学期期末教学质量检测数学文科试题2020届河南省平顶山市第一中学高三下学期开学检测(线上)文数试题(已下线)专题06 数列中的最值问题(第二篇)-备战2020年高考数学大题精做之解答题题型全覆盖
2 . 若无穷数列
满足:对任意两个正整数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c639c7e5f1e7e7ee5d5ee2f30b155bb0.png)
,
与
至少有一个成立,则称这个数列为“和谐数列”.
(Ⅰ)求证:若数列
为等差数列,则
为“和谐数列”;
(Ⅱ)求证:若数列
为“和谐数列”,则数列
从第
项起为等差数列;
(Ⅲ)若
是各项均为整数的“和谐数列”,满足
,且存在
使得
,
,求p的所有可能值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbf78502f5db060afe24dc12a69ee046.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c639c7e5f1e7e7ee5d5ee2f30b155bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8421be1c49f2b03189616b4152dc68ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d25d300078394587098dcd775baa9c15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b60838c79eeec0d75bfff8fc0313a62.png)
(Ⅰ)求证:若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd015442628054692b8cc0a19c77d2bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd015442628054692b8cc0a19c77d2bf.png)
(Ⅱ)求证:若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd015442628054692b8cc0a19c77d2bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd015442628054692b8cc0a19c77d2bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
(Ⅲ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd015442628054692b8cc0a19c77d2bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1bae03ee4ac75dacfb026290e4207dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53ac03ac63e4635c0073f5a0f719392a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aef4f6e4db20f9318388fe748ccbaaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b69969d4ffc3c1a4d04560176be344.png)
您最近一年使用:0次
2020-02-09更新
|
651次组卷
|
2卷引用:北京市西城区2019-2020学年高二上学期期末数学试题
3 . 已知
,
,记
,其中
表示
这
个数中最大的数.
(1)求
的值;
(2)证明
是等差数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b80c1ed7b10ac7ca1cd81cdd39a8fcc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15ff259bff098430a6512d0e4f6fb2d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fae7c25bbcda4893fd243d929c01f969.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d9812dcbb57996f2212b037918ab195.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b125c9321c0d8bd9cf942d6da8bebf16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b14e03f30c56d9943e4a82d0e029b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/312893147a40a4cd5d46fc2ad309c488.png)
(2)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38ef4c4439b36c2847b0056a116d56d4.png)
您最近一年使用:0次
2020-01-10更新
|
296次组卷
|
4卷引用:北京市石景山区2019-2020学年高二上学期期末数学试题
4 . 如果数列
满足“对任意正整数
,都存在正整数k,使得
”,则称数列
具有“性质P”.已知数列
是无穷项的等差数列,公差为d
(1)若
,公差
,判断数列
是否具有“性质P”,并说明理由;
(2)若数列
具有“性质P”,求证;
且
;
(3)若数列
具有“性质P”,且存在正整数k,使得
,这样的数列共有多少个?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/320e7710ac9aafc0ecaf91ba6686cea3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab406d94b4907ab8a20ae3214628b045.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f2572192cc7ca046e9a3155ef3e56a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3068733ef2ceda9f1620d5c9bcdfa542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f8e68eb4ade6e22982d2df5102d8894.png)
(3)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c0af74258551ca3f28b2c6ce54bffd1.png)
您最近一年使用:0次
2018-05-04更新
|
720次组卷
|
5卷引用:北京市第五十七中学2021-2022学年高二下学期期中考试数学试题
5 . 编辑一个运算程序:
,
,
.
(1)设
,求
;
(2)由(1)猜想
的通项公式;
(3)用数学归纳法证明你的猜想.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/058891f664635610295b6e5e33ac49c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0638fc0a7167858f770338a86869ccb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a4802754e39597f08e5e5c35b269a3f.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2c8f2663800c3e6f231cdfa7960a61d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed529240a883f68f0921e818addeb9c8.png)
(2)由(1)猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(3)用数学归纳法证明你的猜想.
您最近一年使用:0次
6 . 已知数列
的通项公式为
.
(1)求证:数列
是递增数列;
(2)若存在一个正实数M使得
对一切
都成立,则称数列
为有界数列.试判断此数列是否为有界数列,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e79d4bd5a097f33c194e0dd2052d81.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若存在一个正实数M使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee632cfe1cc460fbcd32b9e8a630a543.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97769855336d73371930df1f187875e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
您最近一年使用:0次
7 . 如果数列
同时满足以下两个条件:(1)各项均不为0;(2)存在常数
,
对任意
都成立,则称这样的数列
为“
类等比数列”.
(1)若数列
满足
证明数列
为“
类等比数列”,并求出相应的
的值;
(2)若数列
为“
类等比数列”,且满足
问是否存在常数
,使得
对任意
都成立?若存在,求出
,若不存在,请举出反例.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df0db874bff67889a7ab4e6544aad7c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(1)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fca83b26ba9bc757a60c75a2ccdf1b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/554496a09191b59ad974935ac124a1cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e791d1efe1b08b94e1776581c847d4dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c40ba6916865c22cdde2221d9bef9da6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次