名校
解题方法
1 . 已知等差数列
满足
,
.
(1)求数列
的通项公式;
(2)设
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d5c9abd937e015219fb01194ea74f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/463a4d5f2d1d893498d1be84167a747f.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50a813139b92a24e1124ef96e3e485f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
2020-12-02更新
|
486次组卷
|
2卷引用:江西省赣州市南康中学2020-2021学年高二上学期第三次大考数学(文)试题
名校
解题方法
2 . 现某厂商抓住商机在去年用450万元购进一批VR设备,经调试后今年投入使用,计划第一年维修、保养费用22万元,从第二年开始,每年所需维修、保养费用比上一年增加4万元,该设备使用后,每年的总收入为180万元,设使用
年后设备的盈利额为
万元.
(1)写出
与
之间的函数关系式;
(2)使用若干年后,当年平均盈利额达到最大值时,求该厂商的盈利额.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(1)写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)使用若干年后,当年平均盈利额达到最大值时,求该厂商的盈利额.
您最近一年使用:0次
2020-12-02更新
|
248次组卷
|
3卷引用:安徽省安庆市潜山第二中学2020-2021学年高一上学期期中数学试题
安徽省安庆市潜山第二中学2020-2021学年高一上学期期中数学试题江西省萍乡市芦溪中学2022届高三上学期期中考试数学(理)试题(已下线)黄金卷03-【赢在高考·黄金20卷】备战2021高考数学全真模拟卷(新高考专用)
名校
解题方法
3 . 已知数列
是等差数列,其前
项和为
,数列
是等比数列,且
,
,
.
(1)求数列
与
的通项公式;
(2)设
,求数列
的前
项的和
.
![](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/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c5a7a17a394e868e0acd1803a9ab795.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da00560d18f576a37bcc21459698145f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b224a65a8f2d495d327e4a488c0dba1.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
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9221c0c92a526f65533cdc5400767af.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)
您最近一年使用:0次
2020-12-02更新
|
1011次组卷
|
3卷引用:江西省萍乡市2021届高三上学期期中复习试卷(文数)试题
4 . 已知数列
满足:①
;②当
时,
;③当
时,
,记数列
的前
项和为
.
(1)求
的值;
(2)若
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c755f1820820143a01ce753e154a9977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/254e8d498de9ef5d04143a336631c701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f7428a907e1e376d64b44d693f2955f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d27135dbcce940370259c00be012835.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1a5945ce5c2114af8c18718ca8dc899.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)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2df98ce180b9d9e1a83f2c1332e2da9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94d6b8f10142a7b23ee19cae223f378c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
2020-12-02更新
|
209次组卷
|
2卷引用:江西省抚州市临川二中实验学校2019-2020学年高一年级下学期期末考试理科数学试题
名校
解题方法
5 . 已知等差数列
中,
,且
依次成等比数列.
(1)求数列
的通项公式;
(2)设
,数列
的前
项和为
,若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0670ea745fe9621823ca44cb4bff869.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/115cb4268ae0cce581a97c6a49f67f79.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/216876de04325fd250c38c485cbc34b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.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/7d424d602d2107f3db79a6b9e5401e34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
2020-12-02更新
|
674次组卷
|
4卷引用:江西省抚州市临川二中实验学校2019-2020学年高一年级下学期期末考试理科数学试题
名校
解题方法
6 . 已知各项均为正数的等差数列
中,
,且
构成等比数列
的前三项.
(1)求数列
,
的通项公式;
(2)令
,求数列
的前n项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a84917c4f840f34385c1621a26e45fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aca92f92f5defb15f97b682b10d428b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ec4c562595658829f7ec1e58a610a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
2020-12-02更新
|
456次组卷
|
2卷引用:江西省抚州市临川二中实验学校2019-2020学年高一年级下学期期末考试文科数学试题
7 . 已知
是公比为
的等比数列,数列
满足
.
(1)求数列
的通项公式;
(2)若
的前
项和为
,求使得
成立的
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abbf48ec77187d4a7414033fb478d672.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)若
![](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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/973afa7ff4b051b038d76a87a4215026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
2020-12-02更新
|
694次组卷
|
3卷引用:江西省宁冈中学2020-2021学年高二上学期第一次段考数学(理)试题
名校
解题方法
8 . 已知数列
的各项均为正数,对任意的
,它的前n项和
满足
,并且
,
,
成等比数列.
(1)求数列
的通项公式;
(2)设
,
为数列
的前n项和,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2fc16f6a5d7845d7899116dd6dd1066.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc858b7a95c5006a44067022da09f667.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01fffa272005802dda28ac7cbdd0cb02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbd85b79372dc6e596d465f738c3c300.png)
您最近一年使用:0次
2020-12-01更新
|
962次组卷
|
21卷引用:江西省四校联盟2019-2020学年高三第一次联考文科数学试题
江西省四校联盟2019-2020学年高三第一次联考文科数学试题安徽省芜湖市2018-2019学年高一下学期期末模块考试A卷数学试题河北省衡水市衡水中学2019-2020学年高三上学期期中数学(文)试题2020届山东省淄博实验中学高三上学期期末考试数学试题2020届海南省海口市海南中学高三第六次月考试卷数学(已下线)冲刺卷07-决战2020年高考数学冲刺卷(山东专版)(已下线)提升套餐练07-【新题型】2020年新高考数学多选题与热点解答题组合练(已下线)专题03 数列求和问题(第二篇)-备战2020年高考数学大题精做之解答题题型全覆盖(已下线)2020年秋季高三数学开学摸底考试卷(新高考)04(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山东省济宁邹城市第一中学2020届高三下学期数学3月自测试题湖南省邵阳市邵东市第一中学2020-2021学年高三上学期第五次月考数学试题辽宁省开原市第二高级中学2020-2021学年高三第三次模拟考试数学试题安徽省阜阳市颍上第一中学2020-2021学年高二上学期第一次阶段考试理科数学试题(已下线)考点25 数列求和-备战2022年高考数学(理)一轮复习考点帮(已下线)考点24 数列求和-备战2022年高考数学(文)一轮复习考点帮(已下线)考点43 数列的求和-备战2022年高考数学一轮复习考点帮(新高考地区专用)【学科网名师堂】江苏省苏州实验中学2021-2022学年高二10月份调研数学试题湖南师范大学附属中学2022-2023学年高二上学期期末数学试题山东省滨州市滨州行知中学2024届高三上学期模拟预测数学试题安徽省淮北市树人高级中学2023-2024学年高二下学期开学考试数学试卷
名校
解题方法
9 . 已知数列{an}的前n项和Sn和通项an满足2Sn+an=1,数列{bn}中,b1=1,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12d62a020b9a14c7bd3b1ea00b280c61.png)
,(n∈N*).
(1)求数列{an},{bn}的通项公式;
(2)数列{cn}满足
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97b9d521d0db9cf460c885225c2aa61f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12d62a020b9a14c7bd3b1ea00b280c61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19fd85e83029102904571befce54e0e3.png)
(1)求数列{an},{bn}的通项公式;
(2)数列{cn}满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25c2a5f8ec179b72b201c3c0a670612a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a67469e7e2c1bf78231545710959cd9b.png)
您最近一年使用:0次
2020-11-29更新
|
570次组卷
|
5卷引用:2016届云南省昆明三中高三下第一次月考理科数学试卷
名校
解题方法
10 . 等差数列
的前n项和为
,已知
,
.
(1)求
的通项公式;
(2)求
,并求
的最大值.
![](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/06dd3c3b45125d4b484e2894992610f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fca2cc2768794136c1e4da47d2f0873e.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次