名校
1 . 已知数列
的前n项和为
,
且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/575a2b1e89794b5fa00afc66289c7da7.png)
求数列
的通项公式;
设
,求数列
的前n项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b708c8dcb2d66eb2ce0b3718a9cd924a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd2db79c733ee639eba6bd3ec7960826.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/575a2b1e89794b5fa00afc66289c7da7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcd69f5bfe7a0cc0aa7bf73571f0b661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee4464b3b4eb6e52ee02f095aae84f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb26cd1601fe7e76e1e2dc0b4909324a.png)
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2018-12-11更新
|
793次组卷
|
3卷引用:江西省抚州市南城县第二中学2019-2020学年高二下学期开学考试数学(理)试题
名校
2 . 已知数列
的前
项和为
,对任意的正整数
,都有
成立.
(1)求证:数列
为等比数列;
(2)记
,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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5be6da6cf0a1965535b55b34124aeeb.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b7d291b36c6723e3bdf69712550e25.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5e5569f4f6aa689e81eb571ef0fe8da.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
2018-04-12更新
|
899次组卷
|
2卷引用:江西省景德镇一中2020-2021学年高二(2班)上学期期中考试数学试题
名校
解题方法
3 . 已知数列
的
前项和为
,且
.
(1)求数列
的通项公式;
(2)若数列
的前
项和为
,求
.
![](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/c8370a173854471a3eb27637993a3d5d.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc3ae76c1aed18f68a4145e4f7a47560.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/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
2018-02-03更新
|
862次组卷
|
7卷引用:江西省新余市第四中学2017-2018学年高二下学期开学考试数学(理)试题
名校
4 . 已知数列
中,
,
(
).
(1)求证:
是等比数列,并求
的通项公式
;
(2)数列
满足
,求数列
的前
项和为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b3e4e99f1bb2e11e3a240d2d74469f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5566978b9adb511ec5c0cf4313313bfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f562ec93614852b395a602129602d9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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2017-12-09更新
|
1364次组卷
|
4卷引用:江西省新余市2021-2022学年高二上学期期末数学(文)试题
5 . 若数列
的前
项和
满足
.
(1)求证:数列
是等比数列;
(2)记
,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/88d60948fb65e86c170ede4c1cd9fc4f.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c895d4ce5ce82ef9b311b9369b4de11.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21bb3ba5e8dd6655406a760c2988c45a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
名校
6 . 已知数列
的前
项和为
且
,
.
(1)求证
为等比数列,并求出数列
的通项公式;
(2)设数列
的前
项和为
,是否存在正整数
,对任意
,不等式
恒成立?若存在,求出
的最小值,若不存在,请说明理由.
![](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/8d7a9511c3d1b6d41d17df1559919880.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e8adbe4d237aa33ca4d24901df8cfcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02b93708dc68d1509f7030bdf7918bae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad83668ff336589f82a2cd04db9f9947.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/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b04c7ba0ffd54e60b2829f4440c91ec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ae1d8b82b6b00c861167fa7c3a796c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
2017-10-09更新
|
2403次组卷
|
4卷引用:江西省抚州市临川区第一中学2017-2018学年高二上学期第一次月考数学(文)试题
名校
7 . 设数列
的前
项和
,
,且
为等差数列
的前三项.
(1)求数列
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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74d25fca803277aef1c14c9fc6c7e895.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e7a9abc70ba6d77404ab05e02ba067a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6dcba920904a03e3f950e962cc8c7ad.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/731e60bc5b0bd0b66a3ebb2b73b5d2cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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2016-12-04更新
|
966次组卷
|
6卷引用:江西省新余市分宜中学2019-2020学年高二上学期第二次段考数学试卷
8 . 设数列
满足
,
,设
.
(1)求证:
是等比数列;
(2)设
的前
项和为
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10ddd2312f7d7d1a5d5c31fe2a9bc486.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/962c523e622988aa0eb0a2fee0f87749.png)
(1)求证:
![](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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56095d1a5dbc0886c616d13cdae7ac3f.png)
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2016-12-03更新
|
1644次组卷
|
2卷引用:2015-2016学年江西新余一中高二上第一次段考理数学卷
11-12高三·天津·阶段练习
9 . 已知数列
的相邻两项
是关于
的方程
的两根,且
.
(1)求证:数列
是等比数列;
(2)求数列
的前
项和
;
(3)设函数
,若
对任意的
都成立,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d514eb8dff80d4dc3f39de516b63b846.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cbeaa59cf76391392a5772c55aa7919.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4d6dd6774d18f0e37d02add8c39ea6a.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(3)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c1f1146b05a9806adaa5a1ffdb3d51c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c647ce39c059b9dec7fc67125431495f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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2016-12-01更新
|
1061次组卷
|
7卷引用:2013-2014学年江西新余市高二上学期期末理科A数学试卷
(已下线)2013-2014学年江西新余市高二上学期期末理科A数学试卷2014-2015学年江西省南昌市第十九中学高一下学期期中考试数学试卷天津市五校2019-2020学年高二上学期期末联考数学试题(已下线)2012届天津市天津一中高三第三次月考理科数学(已下线)2013届湖南省五市十校高三第一次联合检测理科数学试卷(已下线)2013届山西省山大附中高三3月月考理科数学试卷2014-2015学年黑龙江佳木斯一中高一下学期期中数学试卷
12-13高三上·重庆江北·期中
名校
10 . 设数列
的前
项和为
,满足
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/741e264ca6b880bc633ff491e8e8bec6.png)
,且
,
,
成等差数列.
(1)求
,
的值;
(2)
是等比数列
(3)证明:对一切正整数
,有
.
![](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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28024f526ecf57042dd734ae1741e83c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/741e264ca6b880bc633ff491e8e8bec6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52866a74e4af867ceea0efb1ad06602c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6d5791e7e0bd54d6433c1a4e1fecb7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe61d313eeca8ba47478a9de40540db8.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06ae409648e7f81df297de60d7a756fb.png)
(3)证明:对一切正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/545895a8043bbb2c1264bc0d04e1345f.png)
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