真题
1 . 设数列
是公比
的等比数列,
是它的前n项和.若
,则此数列的首项
的取值范围是_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f71acdb04454c77e1e25ad4f336cccfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f34a5a95a25a3f33ac33a71235a1b2ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
您最近一年使用:0次
2020-06-26更新
|
209次组卷
|
4卷引用:沪教版(上海) 高二第一学期 新高考辅导与训练 第7章 数列与数学归纳法 7.8(2)无穷等比数列各项的和的应用
沪教版(上海) 高二第一学期 新高考辅导与训练 第7章 数列与数学归纳法 7.8(2)无穷等比数列各项的和的应用2001年普通高等学校招生考试数学(文)试题(上海卷)2001年普通高等学校招生考试数学(理)试题(上海卷)(已下线)4.2无穷等比数列各项和(第3课时)(作业)(夯实基础+能力提升)-【教材配套课件+作业】2022-2023学年高二数学精品教学课件(沪教版2020选择性必修第一册)
2 . 如图,在边长为l的等边三角形
中,
为
的内切圆,
与
外切,且与
相切,……,
与
,外切,且与
相切,如此无限下去,记
的面积为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/73f1dd5b-5e53-4d73-930e-f70b626743e7.png?resizew=199)
(1)证明
是等比数列;
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0385df6c7f8ee7ab503b6ed35933695b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cd73875650e1538c4c61d5e16d3db29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0385df6c7f8ee7ab503b6ed35933695b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374fe9986ebbc986fc422e514ab93a51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a8c35a55e727bdce4b784194a2fed96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3ac6e9b691170b86e31939cfc056ef8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374fe9986ebbc986fc422e514ab93a51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3ac6e9b691170b86e31939cfc056ef8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4560c3ab498f2b5aaef05df664315703.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/73f1dd5b-5e53-4d73-930e-f70b626743e7.png?resizew=199)
(1)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f64cb00a5c8fa39c1c902cf5aa59930d.png)
您最近一年使用:0次
2020-06-26更新
|
329次组卷
|
6卷引用:沪教版 高二年级第一学期 领航者 第七章 7.8 无穷等比数列各项的和(2)
3 . 已知数列
满足
,且
,点
在二次函数
的图象上.
(1)试判断数列
是否为算术平方根递推数列?若是,请说明你的理由;
(2)记
,求证:数列
是等比数列,并求出通项公式
;
(3)在数列
中依据某种顺序从左至右取出其中的项
,…,把这些项重新组成一个新数列
,….若数列
是首项为
、公比为
的无穷等比数列,且数列
各项的和为
,求正整数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e976c0663fa749ca749f99842d21ca03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/600ddda5beadd05fb0f12d628c96efe0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23cd773ecfdd16ab5dfa2e1399001269.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92cce4d6a70765a8342178894f6e2bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc78b2e900890d42a2caf610636415b4.png)
(1)试判断数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bf2eb461d12fe388d51cc7f31bce02b.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f7c067b1e4c594552b70ea764a749b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1165edc23b5782b5942ef7e79130bb94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a79b9eaa5e7ab7a1e5c512b571914dc8.png)
(3)在数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1165edc23b5782b5942ef7e79130bb94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1c786d9fe63a1516cfe47cac846f39c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/731f9e522d4ee0883959b69f348fd0fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/078c417ea54a5065c1f72941b9e4b0be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e43c7497cd191bca74dc396c9725a254.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ec6560ef6dc40fc680ef87bbd50001c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/078c417ea54a5065c1f72941b9e4b0be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39f4d1dfd429890baab33ca1a5a77d3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef3e9eb0c4bd9c899886668229c4c947.png)
您最近一年使用:0次
4 . 已知无穷等比数列首项
,所有项的和为S,前n项和为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0859ec83683ed06f08c7e7453b19c3a1.png)
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解题方法
5 . 已知数列
的前n项和为
,
.
(1)求数列
的通项公式;
(2)记
.若对任意正整数n,
恒成立,求k的取值范围;
(3)已知集合
.若以a为首项,a为公比的等比数列前n项和记为
,问是否存在实数a,使得对于任意的
均有
.若存在,求出a的取值范围;若不存在,说明理由.
![](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/8c09ff477b58b64f9cc049ab6b9c484c.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/687e31db0b8191915717fcd1f0f162f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2721e0332fb664e575702592cd77e339.png)
(3)已知集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fea2c004cc0b971284817d6526926b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cfb8967f639217a37f82ad83064b443.png)
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6 . 无穷等比数列首项为2,公比为负数,各项和为S,则有
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
7 . 无穷等比数列
的前
项和
,这里
为常数,则该数列各项的和为
![](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/5e9c7617afbf1f30bbe4c8ae8b6be9e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
8 . 设
,
,求无穷数列
的各项的和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f35078bf9ee6c3b961f8a8b8bc4adba2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e30136113176ba7fe660e998d0873157.png)
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解题方法
9 . 如图,正三角形
的边长为
,
分别是三角形
三边的中点,
表示三角形
的面积,若
,则a的取值范围是_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b16cff607cdc2d69afc70dc778acbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6ec1e326713ddcd6dd66a24a809bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbc98ba814fc53ac574c083a01cad255.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc7de704498375f46c53ed02471f05a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d0a9523f2084cf17b8656c11ab1d95e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ba6f2d24640ab9a039060a173c542c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/974237651b1dd18b6715269128796dae.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/2f426787-c424-448f-9a37-ee3b06172990.png?resizew=157)
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10 . 等比数列
能使
,则
的取值范围为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dff5e575bc8a27a51a550b915f07eda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
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