解题方法
1 . 设等差数列
的前
项和为
,且
,
.数列
满足
,
,
(1)求数列
的通项公式;
(2)求证:数列
是等比数列;
(3)求数列
(
为正实数)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/ae2e6956e0073cef684fef6a16bead0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cde13a1d82174255f34cc22f8127787b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a02563c38f1e5c8fd724af9d6f22563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deda945164283569437cda6976fe35ea.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9a6c852d593cb9f6bdfd9eeddb50fa3.png)
(3)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd7f41822ee607b5dde87bdb13daca84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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名校
解题方法
2 . 已知等差数列
单调递增,其前n项和为
,
,其中
,
,
成等比数列.
(1)求数列
的通项公式;
(2)设
,
的前n项和记为
,求证:
.
![](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/36ba808c24aeae6a2f34b98ae5ec04ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65fc200f10b97588a0c9896277c9c64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/359ee9d15f5390bdb02c62855451323c.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18ec386f0f3ddad65efa9fac2d5bc5d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c3fec47d2dd2b8099d86c87b6e57de8.png)
您最近一年使用:0次
2023-01-15更新
|
260次组卷
|
2卷引用:甘肃省兰州市兰州第六中学2022-2023学年高二上学期期末数学试题
名校
解题方法
3 . 已知数列
的前n项和为
,
是等差数列,且
,
,
是
,
的等差中项.
(1)求
,
的通项公式;
(2)记
,求证:
.
![](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/befe085ed83de607a96416d3eb87c554.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61b6889c2eb291fe0d20fe0ed5cc1ff6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f6714682274c31a328bf796e235900.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.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)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/215533b081864c7b23b85eebc8b778dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e48d315ff1a965b882ce9703f3b6113c.png)
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2023-03-07更新
|
437次组卷
|
2卷引用:山东省聊城市2022-2023学年高二上学期期末数学试题
名校
解题方法
4 . 已知数列
是公差为2的等差数列,它的前n项和为
,且以
,
,
为边长的三角形是直角三角形.
(1)求
的通项公式;
(2)求数列
的前n项和
.并证明:
.
![](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/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba57c83d526ac308d1461e80fcca9f36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a54fbf9c064d2259638f751e77686269.png)
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2023-09-26更新
|
215次组卷
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3卷引用:甘肃省武威市天祝藏族自治县第一中学2023-2024学年高二上学期第一次月考(9月)数学试题
5 . 在①
;②
;③
这三个条件中任选一个,补充在下面问题中,然后解答补充完整的题目.
问题:已知等差数列
为其前n项和,若______________.
(1)求数列
的通项公式;
(2)设
,求证:数列
的前n项和
.
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/57c599e7cec6d192fb73218e7882ceca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f98d7b96c519daa615975d5533c9248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8236c97d9f87ae91ecae8020b03d73a7.png)
问题:已知等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4930a369c43166fbb10757a42339ee7.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2098dc91bf6491336ff649814cbf823f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83d76c3eb0a07a827877d7a4dc306211.png)
注:如果选择多个条件分别解答,按第一个解答计分.
您最近一年使用:0次
2023-02-15更新
|
455次组卷
|
2卷引用:浙江省宁波市余姚市2022-2023学年高二上学期期末数学试题
名校
解题方法
6 . 已知数列
的前
项和为
, 且
, __________.请在
成等比数列;
, 这三个条件中任选一个补充在上面题干中, 并解答下面问题.
(1)求数列
的通项公式;
(2)设数列
的前
项和
, 求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/751c3b0c7d916ddc24d7bd036ea0eecd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4011c597ba394120a1a74b6f4a401159.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25108967f8f95c445c109348592d4fee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff3432f48e3f2e684d45e89403110ea9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9694346716bad8031f17fff37273ddc.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/751c3b0c7d916ddc24d7bd036ea0eecd.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55f3cadcc65d380f74102037b46a4f8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59887a5ab83d604d78b8a204b7f88bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24974f2d84f24c6dc2d836e0d9fa5359.png)
您最近一年使用:0次
2022-12-26更新
|
849次组卷
|
7卷引用:数列求和
(已下线)数列求和广东省揭阳市普宁国贤学校2022-2023学年高二上学期期末数学试题山西省晋城市泽州县晋城一中教育集团南岭爱物学校2022-2023学年高二上学期1月期末调研考试数学试题四川省南充市2021-2022学年高三高考适应性考试(一诊)数学(理)试题(已下线)热点07 数列与不等式-2022年高考数学【热点·重点·难点】专练(新高考专用)湖南省岳阳市2022届高三下学期教学质量监测(三)数学试题四川省遂宁市第二中学校2023届高三上学期一诊模拟考试理科数学试卷(二)
7 . (1)已知等差数列
满足
,
,数列
满足
,
.求
,
的通项公式;
(2)在数列
中,
,
,
①求证:
是等比数列;
②求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b38fda654c021e994ac899d0ecdc6955.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95f293767f23d043f408e50ae88646a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd6c97d2ee3e74ba5730f1cbcc1d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07e42fd1465539b4c54a32273c52adeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)在数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ecf69901899bba130968c7a091790d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d99afdf5472fd4867e7d8a5a7b0845c6.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c7d94406136605c5bc9cd9295d6c9fa.png)
②求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d363b6982fee3bf1337d1542137a2f3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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2022-12-15更新
|
783次组卷
|
4卷引用:新疆维吾尔自治区巴音郭楞蒙古自治州和静高级中学2022-2023学年高二上学期12月月考数学试题
新疆维吾尔自治区巴音郭楞蒙古自治州和静高级中学2022-2023学年高二上学期12月月考数学试题(已下线)专题12 数列大题专项训练第四章 数列章末重点题型归纳(4)(已下线)专题6-3 数列求和-1
8 . 已知数列
的前n项和为
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3d80fae39643a1ab1ba2c9b8edbc919.png)
,______.请在①
:②
,
,
成等比数列:③
,这三个条件中任选一个补充在上面题干中,并解答下面问题.注:如果选择多个条件分别解答,按第一个解答计分.
(1)求数列
的通项公式;
(2)若
,设数列{
}的前n项和
,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36815c5c63a7b8b79974595f4149e292.png)
![](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/c3d80fae39643a1ab1ba2c9b8edbc919.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/132e9579e58d8d5225e2340e1f43adf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc3107c0f22c9b74fb0fdf7fcefe7dcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65fc200f10b97588a0c9896277c9c64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e84c30444f13d37ada78285dc4f83b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ad08078cd3177dc718ad8e74447f21.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7d3d55a85012933f91c5d8d27d8801d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36815c5c63a7b8b79974595f4149e292.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/132e9579e58d8d5225e2340e1f43adf1.png)
您最近一年使用:0次
解题方法
9 . 已知等差数列
的第2项为4,前6项的和为42,数列
的前n项和为
,且
.
(1)求数列
的通项公式;
(2)求证:数列
是等比数列,并求数列
的通项公式;
(3)设
,求证:
.
![](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/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc36d5d31e4801da3b7f5f36ab19194f.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e3f946894e21775f9d2b4219ed627eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f1085371ff3e41098b3169265f24983.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f86ad55b864329a8233894c2619ea187.png)
您最近一年使用:0次
10 . 已知在等差数列
中,
.
(1)求数列
的通项公式;
(2)记数列
的前
项和为
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/558a5c8887f3fbbeab3fa75bda981aba.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)记数列
![](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/0031136b88c5c677de5ab4b3c74b7388.png)
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2023-08-20更新
|
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|
2卷引用:贵州省黔西南州兴义市顶效开发区顶兴学校2022-2023学年高二下学期第三次月考数学试题