1 . 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)
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2020-06-12更新
|
500次组卷
|
6卷引用: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(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
解题方法
2 . 已知
,则使不等式
成立的n的最大值为______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee233e6278bafd1827f08a2e147c0e57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4425491e5267638f5bf6a899eca0dfb.png)
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3 . 在平面直角坐标系中,定义
(
为点
到点
的一个变换,我们把它称为点变换.已知
,
,…,
,
是经过点变换得到的一列点.设
,数列
的前
项和为
,那么
的值为 ________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93e46a3501e076273ecf11aff3a28eb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c051c2459ca7e2edd8ece9e565ec4b09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac0a448a3c412fcae06a12313a9aa139.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24c300da89db76e3578671b50aaf0d16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b7e35faab6d74fa0c36599c39d1698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c051c2459ca7e2edd8ece9e565ec4b09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac0a448a3c412fcae06a12313a9aa139.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79e4256f4f9171a5a5c3708d5e31710f.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/2c21b729cbb0fea00a3623099594cc8d.png)
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名校
4 . 在正项等比数列
中,
则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50a4ed52c746d7f1292f721478fff611.png)
________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4363795f79209d323c4bbeddab85087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50a4ed52c746d7f1292f721478fff611.png)
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2020-02-02更新
|
330次组卷
|
8卷引用:上海市南汇中学2021-2022学年高二下学期期末数学试题
5 . 设n是一个正整数,定义n个实数a1,a2,…,an的算术平均值为
.设集合 M={1,2,3,…,2015},对 M的任一非空子集 Z,令αz表示 Z中最大数与最小数之和,那么所有这样的αz的算术平均值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/362aeccbab473f0c27a27c68a7e6eefd.png)
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名校
6 . 数列
的首项为
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbd54330be1c08e8872ecaa8f74d4fb0.png)
,记
为数列
前n项和,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cd2642dda2eba9b1e6db5c65a24da0a.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbd54330be1c08e8872ecaa8f74d4fb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83f8ce2ce22be8573102161e2500efd7.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/5cd2642dda2eba9b1e6db5c65a24da0a.png)
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2020-01-30更新
|
143次组卷
|
2卷引用:上海市实验学校2017届高三上学期第三次月考数学试题
16-17高一下·上海浦东新·期末
名校
7 . 无穷等比数列
的首项是某个正整数,公比为单位分数(即形如:
的分数,
为正整数),若该数列的各项和为3,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19b7daadaea74c1a9d8f97fd0b4086f1.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46a60e77043cfa243c212f9e340c5f46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19b7daadaea74c1a9d8f97fd0b4086f1.png)
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名校
8 . 已知正项数列
的前n项和为
,对于任意正整数m、n及正常数q,当
时,
恒成立,若存在常数
,使得
为等差数列,则常数c的值为______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4af60e70f570ec61b8170214977bc3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fa1f84422606b095f31d28de57c6ed6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff64b05d758c9a62d64a7f7d2a3a8e6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167e88bdf4608388f0bb981e78119477.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6432a5e3fed32b6a725c6b4fdd746303.png)
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2020-01-10更新
|
559次组卷
|
2卷引用:2018年上海市建平中学高考三模数学试题
9 . 数列
为等比数列,
是等比数列
的前
项和,已知
,则
,则
=_________ .
![](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/d7c33daee1f0d2582651f1cb2632063a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c53b4b54f6be7839de8baff7af19a4a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d27182444d3da4003680f07ec299087c.png)
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