名校
1 . 已知正项数列
的前n项和为
,且对于任意
,有
,若a2=4,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/245b83c92c872de9be0d8c078924daff.png)
_____ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c88c05c564a3fb65c334bf1b8302773.png)
_____ .
![](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/7090724417f906e0d413e9b307265b36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84df781c890580fcadb50d2539824393.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/245b83c92c872de9be0d8c078924daff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c88c05c564a3fb65c334bf1b8302773.png)
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2020-07-06更新
|
268次组卷
|
2卷引用:陕西省西安市铁一中学2022-2023学年高二上学期1月期末数学试题
名校
解题方法
2 . 已知数列
的前n项和为
,且满足
,数列
中,
,对任意正整数
,
.
(1)求数列
的通项公式;
(2)是否存在实数
,使得数列
是等比数列?若存在,请求出实数
及公比q的值,若不存在,请说明理由;
(3)求数列
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/8a5df4d666ed956941509cae1ed53f26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f1a8b0572d26664d15fd09ca22f8bd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea37d7a403608c903e565f30866bb95c.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)是否存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ce4147cbb26fe7b421bdf3f15529f5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
(3)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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2020-02-09更新
|
1544次组卷
|
8卷引用:河南省三门峡市2019-2020学年高二上学期期末数学(理)试题
3 . 若数列
的通项为
,前n项和为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46293a2dd0d822a27f0b57e33c7e6f34.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6d45d1105dd779b4a44ffe4ddfc5d32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46293a2dd0d822a27f0b57e33c7e6f34.png)
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4 . 数列
中
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9b30c3d7cc1e41af67e909df3f39830.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3f4d2a80121f8ff3849b2f363c3f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9b30c3d7cc1e41af67e909df3f39830.png)
A.![]() | B.![]() | C.0 | D.![]() |
您最近一年使用:0次
名校
5 . 已知数列
中,
,
是数列
的前
项和,且
.
(1)求
,
,并求数列
的通项公式
;
(2)设
,数列
的前
项和为
,若
对任意的正整数
都成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9645bd4d2002993b90ec6d48f9c04f7.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/2e8d661225d28286b41d374731569a1e.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb5532d267a60c1fdd8e46679ca485a7.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/ed31a273fd24972a3c5fd999cc75c4b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
2020-01-31更新
|
3286次组卷
|
5卷引用:江苏省常州市2019-2020学年高二上学期期末数学试题
江苏省常州市2019-2020学年高二上学期期末数学试题福建省龙岩第一中学2022-2023学年高二上学期期末质量检测数学模拟试题(已下线)考点21 求和方法(第2课时)讲解-2021年高考数学复习一轮复习笔记(已下线)专题二 数列求和-2020-2021学年高二数学新教材同步课堂精讲练导学案(人教A版2019选择性必修第二册)湖南师范大学附属中学2023届高三上学期第二次月考数学试题
6 . 已知数列
的通项公式为
是数列的前n项和,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6eb2fcf76cd58f6573a059ab1ab48b4.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f7bbaa32c2bd4e6e2353acf6018de0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6eb2fcf76cd58f6573a059ab1ab48b4.png)
您最近一年使用:0次
名校
7 . 数列{
}的前
项和为
,若
,则{
}的前2019项和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9b30c3d7cc1e41af67e909df3f39830.png)
____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.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/f44b1014c58d9dc8600bd64ce939f504.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9b30c3d7cc1e41af67e909df3f39830.png)
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8 . 数列
满足
,则数列
的前
项和等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b6b5374fe77764b329040c8f663deca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b3779b4ea5477aebfe85113b0de1d60.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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9 . 已知数列
,
都是等差数列,
,
,设
,则数列
的前2018项和为
![](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/6f552707ec08bce9f61bf17bce865d99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3d3b280242ca0a9fff5111f2ae908b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eced722fb793770eac2cf98e7154ea9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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10 . 已知数列
的通项公式为
,
的前
项和为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e472ad6e7bf7a6a409a43d4ea9035e0.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23541875ad2fbf3ba93c93f2baa32bdf.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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e472ad6e7bf7a6a409a43d4ea9035e0.png)
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