1 . 已知点
是函数
的图象上一点,数列
的前
项和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23c17bac3a159dbb332ee183477d9579.png)
(1)求数列
的通项公式;
(2)若
,
①求数列
的前n项和
;
②设数列
的前
项和为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5265d99095b635f62c7915298ec0e963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95ff35f3b50966a5e3cbb0b5977af7e3.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/23c17bac3a159dbb332ee183477d9579.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1128c9ca3a9a2f2f75adc78cb2a26f77.png)
①求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5344eadd4711db34e3f935aedd5fb270.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
②设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da72309d2507e2f5e5ed88d8cc08963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aae6358af7332d7609bf8d18467487d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00e383ce24bf851b88cc220a07221d2c.png)
您最近一年使用:0次
2020-04-08更新
|
412次组卷
|
2卷引用:北京市密云区2017~2018学年高三年级9月阶段测试数学(文)试题
2 . 设数列
的前n项和为
,若对于所有的自然数n,都有
,证明
是等差数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5274adf9ab52f082fb4f8f557e701621.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
您最近一年使用:0次
名校
3 . 数列
的前
项和记为
,若数列
是首项为9,公差为
的等差数列.
(1)求数列
的通项公式
;
(2)若
,且数列
的前
项和记为
,求
的值.
![](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/4dea1dd4ffcb4cf0697ca43079f6a1f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9ebf05ca12f9da810b2b10e066ececf.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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9258d63d4f08a3177567873c50a2caf6.png)
您最近一年使用:0次
2019-12-08更新
|
474次组卷
|
2卷引用:北京市海淀区清华大学附属中学2019-2020学年高三上学期10月月考数学试题
4 . 已知数列
的前
项和
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/379b88c3c830c8814e817a11a9879041.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/4695f7d09c11f1ededdd30ae3ae01b9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/379b88c3c830c8814e817a11a9879041.png)
您最近一年使用:0次
2019-10-25更新
|
1065次组卷
|
6卷引用:广东省中山市第一中学2019-2020学年高二上学期10月月考数学试题
5 . 若对任意的正整数
,总存在正整数
,使得数列
的前
项和
,则称
是“回归数列”.
(1)①前
项和为
的数列
是否是“回归数列”?并请说明理由;
②通项公式为
的数列
是否是“回归数列”?并请说明理由;
(2)设
是等差数列,首项
,公差
,若
是“回归数列”,求
的值;
(3)是否对任意的等差数列
,总存在两个“回归数列”
和
,使得
成立,请给出你的结论,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.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/3693c7c942afef5517a3c18997c878df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(1)①前
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d255ea8e125b603d6b640bdf4a804922.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
②通项公式为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42fef6975d285cabcf6be67c78f30d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)设
![](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/d2d8bbb4a09e0ac86bbae46222a90841.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
(3)是否对任意的等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d053924a53b4839e4cefc598e1e6b0.png)
您最近一年使用:0次
2019-06-17更新
|
855次组卷
|
10卷引用:北京市东城汇文中学2017-2018学年高三上期中(理)数学试卷
北京市东城汇文中学2017-2018学年高三上期中(理)数学试卷【全国百强校】北京101中学2018-2019学年下学期高一年级期中考试数学试卷2019届北京市十一学校高三下学期月考(2月)数学(理)试题(已下线)专题08 拿高分题目强化卷(第三篇)-备战2021年新高考数学分层强化训练(北京专版)河北省定州中学2018届高三下学期第一次月考数学试题2【全国百强校】上海市金山中学2018届高三上学期期中考试数学试题2022届北京市房山区良乡中学高三模拟考试数学试卷北京理工大学附属中学2024届高三上学期数学10月练习试题上海市上海师范大学附属中学2022届高三下学期3月月考数学试题(已下线)专题18 数列中的创新题的解法 微点1 数列中的创新题的解法
名校
6 . 若数列
的前
项和
,
则满足
的
的最小值为________
![](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/75a310c548bfaf3a54140023277cf390.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b69afd3ed400c0cfd339c4a5135ccad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9645bd4d2002993b90ec6d48f9c04f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
2019-05-09更新
|
532次组卷
|
2卷引用:【区级联考】北京市海淀区2019届高三年级第二学期期末练习(二模)数学理科试题
名校
7 . 已知数列
的前
项和
,其中
.
(Ⅰ)求数列
的通项公式;
(Ⅱ)若
(
)为等比数列
的前三项,求数列
的通项公式.
![](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/201c985aeb7a5c440bee38f1f8b8e460.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
(Ⅰ)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/335112fe8b0738341b7622375af07415.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46b6d151d3f864bae873987f6db9327a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
您最近一年使用:0次
2019-04-13更新
|
648次组卷
|
2卷引用:【区级联考】北京市西城区2019届高三4月统一测试(一模)数学文试题
10-11高三上·北京东城·阶段练习
名校
8 . 在等比数列{an}中,an>0 (n∈N ),公比q∈(0,1),且a1a5+2a3a5+a2a8=25,又a3与a5的等比中项为2.
(1) 求数列{an}的通项公式;
(2) 设
,数列{bn}的前n项和为Sn,当
最大时,求n的值.
(1) 求数列{an}的通项公式;
(2) 设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96bac4acf64df3275efd013f163a4e0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e0fcb8a984cea26358e867ccea350a.png)
您最近一年使用:0次
2018-11-25更新
|
720次组卷
|
7卷引用:2010年北京东城区高三上学期理科数学综合练习(一)
(已下线)2010年北京东城区高三上学期理科数学综合练习(一)(已下线)2010年北京东城区高三上学期文科数学综合练习(一)【全国百强校】宁夏石嘴山市第三中学2018-2019学年高二上学期期中考试数学(文)试题四川省南充市高中2019-2020学年高三第一次高考适应性考试数学(理)试题四川省南充市高中2019-2020学年高三第一次高考适应性考试数学(文)试题四川省双流中学2019-2020学年高二下学期复学考试数学(理)试题(已下线)4.2 等差数列-2021-2022学年高二数学同步精品课堂讲+例+测(苏教版2019选择性必修第一册)
解题方法
9 . 已知数列
的前
项和为
,且
.
(1)求
的值;
(2)求证:
.
![](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/83745c258a8499f8d81716fc3af87709.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c14d9ae06f864498048d55088ff4e6.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dd08f51cd847187141d2759083946ed.png)
您最近一年使用:0次
13-14高三·全国·课后作业
名校
10 . 定义:称
为n个正数p1,p2,…,pn的“均倒数”,若数列{an}的前n项的“均倒数”为
,则数列{an}的通项公式为an=_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ed7720846d6a7b71965ee5e1e347513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6347c5d41a0ceb052eb8cacf8f9f8a77.png)
您最近一年使用:0次
2018-06-14更新
|
740次组卷
|
7卷引用:【全国百强校】北京101中学2017-2018学年下学期高一年级期中考试数学试题