1 . 已知数列
的前
项和为
,把满足条件
(对任意的
)的所有数列
构成的集合记为
.
(1)若数列
的通项为
,判断
是否属于
,并说明理由;
(2)若数列
的通项为
,判断
是否属于
,并说明理由;
(3)若数列
是等差数列,且
,求
的取值范围.
![](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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/772a40f2fe006d9f15c82eb3fd5b78a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(1)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3919cbdc2edbb3237d379f2b7eeb36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a78a26e3eeac053424c52ab90f6a3490.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(3)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb6a0be735ff99ec17214e79fab3b8d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
您最近一年使用:0次
2020-06-25更新
|
319次组卷
|
3卷引用:上海市南洋中学2021届高三下学期3月月考数学试题
名校
解题方法
2 . 在平面直角坐标系中,定义
(
)为点
到点
的变换,我们把它称为点变换,已知
,
,
,
是经过点变换得到一组无穷点列,设
,则满足不等式
最小正整数
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75f6138fb762d7fca4c295153b716616.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb9979465ce76b8582067703b39a0bc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75a73f95353bb2782779c976a6b82737.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a42795469ed8ba12729fcebd710e8795.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3a4422395ca20fe847419ec569e48b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eddbde5d269189fced4cc478908a6866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37e5531913e2f170465d8df01795cd51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05c5bbac2b16b461a28d350728aee67f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/595fd9d54ab549c3462bc7e2be8370a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.9 | B.10 | C.11 | D.12 |
您最近一年使用:0次
2020-06-13更新
|
1238次组卷
|
8卷引用:上海市建平中学2020届高三下学期6月月考数学试题
3 . 设由复数组成的数列
满足:对任意的
,都有
(
是虚数单位),则数列
的前2020项和的值为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6a71dce20a87b70907438836fce9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
您最近一年使用:0次
2020-06-12更新
|
500次组卷
|
6卷引用:上海市静安区2020届高三下学期6月教学质量检测数学试题
上海市静安区2020届高三下学期6月教学质量检测数学试题上海市进才中学2022届高三下学期3月月考数学试题上海市实验学校2022届高三下学期5月月考数学试题2020届上海市静安区高三第二次模拟数学试题湖北省黄石市第二中学2020-2021学年高三上学期10月测试数学试题(已下线)对点练39 等比数列及其前n项和-2020-2021年新高考高中数学一轮复习对点练
4 . 定义:
是无穷数列,若存在正整数k使得对任意
,均有
则称
是近似递增(减)数列,其中k叫近似递增(减)数列
的间隔数
(1)若
,
是不是近似递增数列,并说明理由
(2)已知数列
的通项公式为
,其前n项的和为
,若2是近似递增数列
的间隔数,求a的取值范围:
(3)已知
,证明
是近似递减数列,并且4是它的最小间隔数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5868622de607b54d53fc6c481dc6302d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebd6e7277f682a7f7adf2243ac5c9e2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)已知数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97b2c4b8c1ebc9a3622f7d09de41496f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846fa57d92d6ad44d6a0cafad1e71ed4.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73841553d9289a6463664c8ea4647127.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
您最近一年使用:0次
2020-05-19更新
|
398次组卷
|
4卷引用:上海市七宝中学2022届高三上学期十月月考数学试题
上海市七宝中学2022届高三上学期十月月考数学试题2020届上海市宝山区高三下学期二模数学试题(已下线)上海市华东师范大学第二附属中学2019-2020学年高一下学期期末数学试题上海市文建中学2022-2023学年高一上学期期中数学试题
名校
解题方法
5 . 设数列
对任意
都有
(其中
、
、
是常数) .
(Ⅰ)当
,
,
时,求
;
(Ⅱ)当
,
,
时,若
,
,求数列
的通项公式;
(Ⅲ)若数列
中任意(不同)两项之和仍是该数列中的一项,则称该数列是“封闭数列”.当
,
,
时,设
是数列
的前
项和,
,试问:是否存在这样的“封闭数列”,使得对任意
,都有
,且
.若存在,求数列
的首项
的所有取值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708ecce72c7002204dc114d8df4ef913.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
(Ⅰ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a882037b9ce104ecc496e0f31a139361.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcdb7a488910743dc5c63afb394b87e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee4ee43bf33b641aadeba4dd939cfa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5fe8fecffe2d718a9a346173e5f7e6e.png)
(Ⅱ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/143b917df0520097be222accbddf9394.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59d9880afb9e2262dbfcf20235e85a62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced4e381e8c3336848b8c436dbc584f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a77080abccc0503b2a90eec3a64e10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(Ⅲ)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/143b917df0520097be222accbddf9394.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59d9880afb9e2262dbfcf20235e85a62.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/1bf4000fec5bf94d56935108d72af3c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1d236a265a6cc0f3d06a0e568ffa907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abda7bb44fd2ba0f5c8fe8ed957748f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
您最近一年使用:0次
2020-04-08更新
|
239次组卷
|
4卷引用:上海市长宁区延安中学2017届高三上学期12月月考数学试题
上海市长宁区延安中学2017届高三上学期12月月考数学试题2020届北京市育英中学高三3月月考数学试题江苏省合作联盟学校2019-2020学年高三下学期阶段性调研测试数学试题(已下线)考向18 数列不等式-备战2022年高考数学一轮复习考点微专题(上海专用)
解题方法
6 . 数列
是等比数列,
,
,且公比
为整数,则数列
的前
项和
的值为__________ ;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/961c1b28170a1c0c0ea36593eb635dbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33f11d02c774e3a41bfe1621548b2b47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.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)
您最近一年使用:0次
名校
7 . 已知数列
是等比数列,其前
项和为
,则下列结论正确的是( )
![](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)
A.若![]() ![]() | B.若![]() ![]() |
C.若![]() ![]() | D.若![]() ![]() |
您最近一年使用:0次
2020-02-12更新
|
207次组卷
|
2卷引用:上海市复旦大学附属中学2021届高三下学期4月月考数学试题
名校
解题方法
8 . 数列
前n项的和为
,且
,
,
;
(1)求数列的通项公式;
(2)求
的值;
![](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/32897d1edf2e70afbe36d2b61bf3c83e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bce6187f3f11e0ceead8a645f5f9d32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
(1)求数列的通项公式;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ca2805cdf461114216a882ee64d2d1.png)
您最近一年使用:0次
9 . 设无穷等比数列
的公比
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e2727c0faee8a602bfd908b4607dfc.png)
_____
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7bfb71a22c80ad4ba91d9f229e1349c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c14f9e7a9f2db11cffc3a49224c1f8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e2727c0faee8a602bfd908b4607dfc.png)
您最近一年使用:0次
2020-02-09更新
|
77次组卷
|
2卷引用:上海市上海中学2017届高三上学期10月月考数学试题
解题方法
10 . 若等比数列
的前
项和为
,且满足
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b8d9ff82ab59e62f9ac36298f58ab39.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/aeb9b1e2f2ed752b5a262f09e7d2ab82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b8d9ff82ab59e62f9ac36298f58ab39.png)
您最近一年使用:0次
2020-02-07更新
|
136次组卷
|
2卷引用:上海市理工附中等七校2016届高三下学期3月联考(文)数学试题