解题方法
1 . 设
为数列
的前
项和,已知
.
(1)证明: 数列
是等比数列;
(2)设
,求数列
的前
项和
.
![](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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b39c80b0a63bb7821adb58dfd56de6ec.png)
(1)证明: 数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e2de706dc5f0439b989273a5367f63a.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89d433a3c49f25a480837c9e2a5fb587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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2 . 已知数列
的前
项和为
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a86f9f2909ee296f5a5e29f44f081cbb.png)
(1)求数列
的通项公式;
(2)若__________,求数列
的前
项和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
从①
;②
;③
,这三个条件中任选一个补充在上面的横线上并解答问题
![](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/a86f9f2909ee296f5a5e29f44f081cbb.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若__________,求数列
![](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)
从①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d1e05badd9c8b9c370beb34b7c9ff5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2570ebf24b2ccaa04af00e5cb1e8a26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f1f67cb6dfc57b69963f2d3d51ffe9e.png)
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2024-05-11更新
|
731次组卷
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3卷引用:四川省眉山市2024届高三下学期第三次诊断考试理科数学试题
名校
解题方法
3 . 已知数列
中,
为
的前
项和,
.
(1)求数列
的通项公式;
(2)令
,求数列
的前
项和
.
![](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/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08e7d0c282cd14c00ec4e3ff544b2b45.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfbbbe71585920fe16b990ccc129c626.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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2024-05-04更新
|
1321次组卷
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4卷引用:四川省成都市成都外国语学校2023-2024学年高二下学期4月期中考试数学试题
四川省成都市成都外国语学校2023-2024学年高二下学期4月期中考试数学试题云南省三新教研联合体高二第二次联考数学试卷和参考答案(已下线)第18题 数列不等式变化多端,求和灵活证明方法多(优质好题一题多解)(已下线)第18题 等差等比综合考查,生成数列通项求和(优质好题一题多解)
解题方法
4 . 已知
是等差数列,
是等比数列,且
的前n项和为
,在①
,②
这两个条件中任选其中一个,完成下面问题的解答.
(1)求数列
和
的通项公式;
(2)设数列
的前n项和为
,是否存在
,使得
若存在,求出所有满足题意的
;若不存在,请说明理由.
![](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/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274191cca23e72fa887829f4527e98c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ff8ce3e59c069490084ffc200cfda9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47a99b841116f01b845a324da81d786c.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2767882820f4ba0defde0e412adb747f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38b6286e5f74b604b9fb639c55d611f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0137430ff7d1753310cf17a5f0e58b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
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5 . 已知等比数列
的前
项和为
,满足
,则
( )
![](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/73ad5e68c8b0a2f11b4aba73103e3a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfc875ca919921e8f63a6fca648561b.png)
A.![]() | B.![]() | C.9 | D.27 |
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2024-04-23更新
|
608次组卷
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2卷引用:四川省绵阳市高中2024届高三第三次诊断性考试理科数学试卷
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解题方法
6 . 已知数列
中
且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6065aaa8f3f103d1bc960da8318ce35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8ba7c26456e0715f49f377c7cde2d98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
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2024-04-18更新
|
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3卷引用:四川省广安市友实学校2023-2024学年高二下学期第一次月考数学试题
四川省广安市友实学校2023-2024学年高二下学期第一次月考数学试题上海市青浦高级中学2023-2024学年高二下学期3月质量检测数学试卷(已下线)模块五 专题2 全真基础模拟2(人教B版高二期中)
7 . 已知数列
的前n项和为
,满足
(
且
),
.
(1)证明:数列
为等比数列;
(2)设数列
满足
,证明:
.
![](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/6cd631494172f5769a7c936a653ef885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a37a59558292ad6b3d0978bfd7484990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39ca2fb62c07207b130efda985fc2095.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3f0bdc25fcd27715befb51fc477e241.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efca64c2b9a1d555a67c405cbadbe21f.png)
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2024-04-12更新
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2卷引用:四川省仪陇中学校2023-2024学年高二下学期第一次月考(4月)数学试题
8 . 等比数列
中
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f7c72e473cf39f54b20a779a204c8fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdfe37d536c2f83b8da9810fd410f82e.png)
A.![]() | B.5 | C.10 | D.20 |
您最近一年使用:0次
9 . 已知各项均为正数的等比数列
的前n项和为
,若
,
,
成等差数列,且
.
(1)求
;
(2)若
,求数列
的前n项和
.
![](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/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b6fae41755ecb64ac239a5a2d767354.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22ab4706be6b3854b9c30ab609e5da68.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41d527d9b8c65ce00307c68d93bfeaec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da72309d2507e2f5e5ed88d8cc08963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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名校
解题方法
10 . 关于等差数列和等比数列,下列说法正确的是( )
A.若数列![]() ![]() ![]() ![]() |
B.若![]() ![]() ![]() ![]() |
C.若数列![]() ![]() ![]() ![]() |
D.若数列![]() ![]() ![]() ![]() |
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2024-03-07更新
|
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8卷引用:四川省成都市简阳实验学校2023-2024学年高二下学期3月月考数学试题
四川省成都市简阳实验学校2023-2024学年高二下学期3月月考数学试题四川省成都市第七中学(高新校区)2023-2024学年高二下学期4月学科素养测试数学试卷山东省青岛市即墨区2023-2024学年高二上学期1月教学质量检测数学试题湖北省恩施州咸丰春晖高级中学2023-2024学年高二下学期第一次月考数学试题广东省佛山市顺德市李兆基中学2023-2024学年高二下学期3月月考数学试题(已下线)高二下学期期中考试(范围:数列、导数、计数原理)-2023-2024学年高二数学下学期重难点突破及混淆易错规避(人教A版2019)广东省佛山市顺德区华侨中学2023-2024学年高二下学期3月月考数学试卷黑龙江省哈尔滨市第十一中学校2023-2024学年高二下学期期中考试数学试题