1 . 在①
且
,②
,③
,且
成等差数列这三个条件中任选一个,补充在下面问题中,并作答.
问题:设数列
的前n项和为
,_________.若
,求数列
的前n项和为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28573138dc1359d49af6f37137cc4fc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c50fa0d2d0499f55fafe23f808344983.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebfac0ec81dcbc3e75759bb8758e2de6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d405b6fef136cce09295e70354d1009.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b050ad7011155273348d50d55086eac.png)
问题:设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](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/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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2020-12-17更新
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7卷引用:山东省百所名校2020-2021学年上学期高三上学期12月联考数学试题
2 . 已知等差数列
的前
项和为
,
是各项均为正数的等比数列,
,______,
,
,是否存在正整数
,使得数列
的前
项和
,若存在,求出
的最小值;若不存在,说明理由.从①
,②
,③
这三个条件中任选一个补充到上面问题中并作答.(注:如果选择多个条件分别解答,按第一个解答计分.)
![](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/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a453294dd3b3323b00f05d7b79008408.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/881f97c0f967fab6c98f20ef721154c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/175a5fc6082f65443f24a20195cbfff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8050391385b496e9c059201e4f12600a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b5d85c24896df67e0b4e41c214bd40f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52ff4f2d9a76730a7ff5baf43da46f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b52e18f280e65998d2ee45f6a7a43b18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19758869dd09c6302d7fbd983fe162c8.png)
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4卷引用:山东省济南市莱芜第一中学2020-2021学年高三上学期1月月考数学试题
山东省济南市莱芜第一中学2020-2021学年高三上学期1月月考数学试题2020届山东省烟台市高考诊断性测试(4月)数学试题江苏省常州市“教学研究合作联盟”2020-2021学年高二上学期期中数学试题(已下线)必刷卷01-2021年高考数学考前信息必刷卷(山东专用)
名校
解题方法
3 . 设正项数列
的前
项和为
,
,且
.
(1)证明:数列
是等差数列并求数列
的通项公式;
(2)已知
,数列
的前
项的和为
,若
对一切
恒成立,求
的取值范围.
![](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/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cea81a128a2c5fb53469b4ca2ad5af5.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/832d1e3a06f59a35396aac6e12c5e2ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/788c71b5ece324f2506fc5f856752a78.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/2f3c032ef5395e12e95961ba2a38e7ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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2020-12-13更新
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6卷引用:山东省济南市市中区实验中学西校区2020-2021年高三下学期2月月考数学试题
4 . 记
为等差数列
的前n项和,已知
,从以下两个条件中任选其中一个(1)
.(2)
.
(1)求公差d及
的通项公式;
(2)求
,并求
的最小值及取最小值时的项数.
![](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/df93c3ba86ea86c617ca7cf0236c7f53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4107fd29fbc133c073532ff21deae06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d44452ccfd15b9ebb6d4f68c348a7433.png)
(1)求公差d及
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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名校
解题方法
5 . 记
为等差数列
的前
项和,已知
,
.
(1)求公差
及
的通项公式;
(2)求
,并求
的最小值.
![](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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/738dc67ac3b150252a964d1ffe3dfa63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8657a9f3eec0c1b0efa818f778129e4.png)
(1)求公差
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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2020-12-07更新
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6565次组卷
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13卷引用:山东省济南第十一中学2020-2021学年第一学期期中考试高二年级数学试题
山东省济南第十一中学2020-2021学年第一学期期中考试高二年级数学试题(已下线)期中模拟考试题(A卷基础篇)-2020-2021学年高二数学课时同步练(人教B版2019选择性必修第三册)(已下线)第五章 数列(章末测试卷)-2020-2021学年高二数学课时同步练(人教B版2019选择性必修第三册)广西南宁市第三中学、北海中学2020-2021学年高一6月联考数学试题(已下线)第五章 数列 本章小结四川省泸州市泸县第一中学2020-2021学年高一下学期第一次阶段性数学理科试题沪教版(2020) 选修第一册 新课改一课一练 第4章 4.1.2 等差数列的前n项和(已下线)第02讲 等差数列及其前n项和 (高频考点—精讲)-2辽宁省阜新市第二高级中学2021-2022学年高二下学期期末数学试题广东省广州市第九十七中学2022-2023学年高二上学期12月阶段训练数学试题第四章 数列(练基础)(已下线)4.2.2等差数列的前n项和(第2课时)(分层作业)-【上好课】2022-2023学年高二数学同步备课系列(人教A版2019选择性必修第二册)(已下线)第4.2.2讲 等差数列的前n项和公式(第1课时)-2023-2024学年新高二数学同步精讲精练宝典(人教A版2019选修第二、三册)
6 . 已知数列
的前
项和
,数列
是首项为2,公比为2的等比数列.
(1)求数列
和数列
的通项公式;
(2)求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4300dca231e2f4b37f70900b33439d5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ad96cde727033432adfc494bf29ade2.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ad96cde727033432adfc494bf29ade2.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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2020-12-02更新
|
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6卷引用:山东省济南市章丘区第一中学2020-2021学年高三上学期一轮复习联考(三)数学试题
名校
解题方法
7 . 已知数列
,
的前n项和分别为
,
且
,
.
(1)求数列
的通项公式;
(2)记
,若
恒成立,求k的最小值.
![](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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9645bd4d2002993b90ec6d48f9c04f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1386763a09010841b77498809d0d66.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdc2484edde10f9f861d0002f624ac64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39a2d08a0ee22565b77338ac04be2877.png)
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2020-11-27更新
|
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2卷引用:山东师范大学附属中学2020-2021学年高三11月学业水平测试数学试题
8 . 在①
,②
,③
这三个条件中选择两个,补充在下面问题中,并给出解答.已知数列
的前n项和为
,满足__________,__________;又知正项等差数列
满足
,且
,
,
成等比数列.
(1)求
和
的通项公式;
(2)若
,求数列
的前n项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/861910d824c1dcb7d6a18d2e02389008.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ee45219629dd30af171588e646f8b12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc6ebd802d5153fe33530e2fbb1aa21b.png)
![](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/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/385275d29d8c8a7841eaeaa3dfab2cdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b715e7842b95f654f16056a7c7f2abe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c493b9bf693aa7b9b964c488729256.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57483e04fd1840c87ac5325157149877.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac07953530e3c248b3438fb200fb1661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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2020-11-27更新
|
1226次组卷
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6卷引用:山东师范大学附属中学2020-2021学年高三11月学业水平测试数学试题
山东师范大学附属中学2020-2021学年高三11月学业水平测试数学试题江苏省无锡市宜兴市丁蜀高级中学2020-2021学年高三上学期期中检测数学试题(已下线)黄金卷01-【赢在高考·黄金20卷】备战2021高考数学全真模拟卷(新高考专用)(已下线)仿真系列卷(02) - 决胜2021高考数学仿真系列卷(江苏等八省新高考地区专用)湖南省邵阳市新邵县2021届高三下学期新高考适应性考试数学试题宁夏银川市永宁县上游高级中学2023-2024学年高二上学期月考(二)数学试题
9 . 已知数列
的前
项和为
满足
.
(1)求数列
的通项公式;
(2)设
,求数列
的前
项和
.
![](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/4300dca231e2f4b37f70900b33439d5e.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1f55ee5533c4eb426b2cd0f911458ba.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)
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2020-10-10更新
|
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3卷引用:山东省济南市莱芜第一中学2022-2023学年高二上学期第三次阶段性考试数学试题
10 . 若数列
满足
(
,p为常数),则称数列
为等方差数列,p为公方差.
(1)已知数列
,
,
,
分别满足
,
,
,
,从上述四个数列中找出所有的等方差数列(不用证明);
(2)若数列
是首项为1,公方差为2的等方差数列,求数列
的前n项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/595955aa3a2670abcd60c78a5086f2fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29d5ec9ad92f37e64eccce922ab1b14e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(1)已知数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38ef4c4439b36c2847b0056a116d56d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d813f3ca8db41a4db6c18eac30fef98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e976c0663fa749ca749f99842d21ca03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1165edc23b5782b5942ef7e79130bb94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ed3e9ffff5ee15df77acad96e5efd08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48efe4d781c67e697b6f5876bdfb754b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9bd47610af84b5c2136f3f996cb60de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ecd353d6f74d3052b1a95dbf83d1704.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c806dc9bf2cad0cb20220d23bd252a2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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2020-07-05更新
|
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|
3卷引用:2020届山东省济南市高三第一次模拟考试数学试题