名校
解题方法
1 . 已知各项是正数的数列
的前n项和为
,若
,且
.
(1)求
;
(2)求数列
的通项公式;
(3)若
对任意
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2839594254ee93616941dbc461e4b965.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1db81807f5c316d24b819077e0778f93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1933b7c3ace69622339353431c519b13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
名校
解题方法
2 . 设数列
的前n项和为
.
(1)求
;
(2)令
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8b4739d3c98677ae8fa9e46035c358a.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4ff0b098c823d4ac872ad495e86be2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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名校
解题方法
3 . 已知
都是各项不为零的数列,且满足
,
,其中
是数列
的前
项和,
是公差为
的等差数列.
(1)若数列
的通项公式分别为
,求数列
的通项公式;
(2)若
(
是不为零的常数),求证:数列
是等差数列;
(3)若
(
为常数,
),
(
,
),对任意
,
,求出数列
的最大项(用含
式子表达).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8ae5eda314447b9d32aa65c4fef9d8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a2090302ed425d7856dd01da759de66.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/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38ef4c4439b36c2847b0056a116d56d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85217cf0edbcc41703b3a44ff6e99d5d.png)
(1)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23041f38de082c9a8e86d932839d8f09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83e3459c5244b1ef1690181276ae553d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a1b790bf782345d2a5257a463a09baf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fd98f0b01585d9c16c5a368dbeeecd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e36bff57bcfa86432b340e25e51d42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31b5aaee963c563972c8b64894032d01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9a6c852d593cb9f6bdfd9eeddb50fa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
4 . 数列
满足:
,
.
(1)求
的通项公式;
(2)设
,数列
的前
项和为
,求满足
的最小正整数
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88c38c6ae5fdf0e09283e5ba2d7f4e5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e5fc0b571e6545e133d36af338733b6.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/3cdeb46052fa00d013b4391b5c34be0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
2020-10-17更新
|
612次组卷
|
18卷引用:四川省成都市双流棠湖中学2019-2020高三上学期开学考试数学(理)试题
四川省成都市双流棠湖中学2019-2020高三上学期开学考试数学(理)试题四川省棠湖中学2019-2020学年高三上学期开学考试数学(文)试题【市级联考】河南省郑州市2019年高三第二次质量检测数学(文)试题福建省福州市师范大学附中2019-2020学年高三上学期期中数学(文)试题河南省驻马店市正阳县高级中学2019-2020学年高二上学期第三次素质检测数学(理)试卷河南省郑州市八校联考2019-2020 学年上学期期中高二文科数学试题山东省烟台市莱阳市第一中学2019-2020学年高三上学期10月月考数学试题2019届安徽省合肥市第九中学高三下学期最后一次模拟数学(理)试题湖南省长沙市雅礼中学2020届高三下学期高考模拟试卷(二)数学(文)试题黑龙江省大庆市第四中学2020届高三上学期第一次检测数学(文)试题安徽省阜阳市太和第一中学2020-2021学年高三上学期第一次校本教材反馈测试数学(理)试题(已下线)专题7.1 数列的概念与简单表示(精练)-2021年新高考数学一轮复习学与练江苏省无锡市第三高级中学2020-2021学年高二上学期10月基础测试数学试题(已下线)专题4.1 数列的概念(B卷提升篇)-2020-2021学年高二数学选择性必修第二册同步单元AB卷(新教材人教A版,浙江专用)(已下线)专题5.1 数列基础(B卷提升篇)-2020-2021学年高二数学选择性必修第三册同步单元AB卷(新教材人教B版)安徽省滁州市定远县民族中学2022-2023学年高三上学期11月期中数学试题(已下线)2019年12月29日《每日一题》必修5+选修2-1理数-每周一测内蒙古自治区赤峰市2020-2021学年高一下学期期末联考文科数学试题(A)
5 . 设
为正项数列
的前
项和,且满足
.
(1)求
的通项公式;
(2)令
,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](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/b61cc942eaa2c2d9f47608ddfcdd716c.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/216876de04325fd250c38c485cbc34b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6e5408daf8c4918e8baf4f4cfd0a4cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
解题方法
6 . 已知数列
的前
项和为
,且满足
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e4487468ab2823d6dbf7f0ebd2eb38.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/3d414194bc918d0c1d722f9ece90ff09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e4487468ab2823d6dbf7f0ebd2eb38.png)
您最近一年使用:0次
2020-05-26更新
|
338次组卷
|
2卷引用:2020届四川省攀枝花市高三第三次统一考试数学(理)试题
名校
解题方法
7 . 数列
的前
项和
,若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a694158a6092664fa54e4dd835214e0.png)
,则
( )
![](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/9fe109cfe011fed2acc386049c7f5893.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a694158a6092664fa54e4dd835214e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a89a540ece7085ccff03802c0418e0f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/624de6b69c8a960117b26f290d726277.png)
A.6 | B.8 | C.9 | D.10 |
您最近一年使用:0次
2020-05-22更新
|
415次组卷
|
5卷引用:四川省绵阳中学2022-2023学年高二上学期11月月考数学(理)试题
名校
解题方法
8 . 已知数列
的前
项和
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.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/c3d2dd8cb8712c7890b14cf5beedf17f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
您最近一年使用:0次
2020-05-08更新
|
338次组卷
|
7卷引用:四川省仁寿第一中学校南校区2019-2020学年高一下学期开学考试数学试题
9 . 定义
为n个正数
,
,…,
的“均倒数”,若已知数列
的前n项的“均倒数”为
,又
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9f8d8c20af9cbcc3eb4b1d9b3180e0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8be646cd52d7f2f1714e7542e75810f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adad9633b73dfbbb3d84b4f15979e99e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ffb021aa7d5a5c2f0691e337caad624.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea54e6a35d85b5e3b20941715390ffb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/528a9595c563858776045b6ebfc526a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/658a59b2cd88bcedd748bd2d79b595be.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2020-04-30更新
|
303次组卷
|
4卷引用:四川省宜宾市第四中学2020-2021学年高二上学期开学考试数学(理)试题
四川省宜宾市第四中学2020-2021学年高二上学期开学考试数学(理)试题四川省宜宾市第四中学2020-2021学年高二上学期开学考试数学(文)试题湖北省襄阳市第一中学2019-2020学年高二下学期2月月考数学试题(已下线)痛点9 数列的综合问题-2021年新高考数学一轮复习考点扫描
名校
解题方法
10 . 若数列
是正项数列,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7743581de704323479bd177a55ab9d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a72dbfd5c851776364e819c435e54d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
您最近一年使用:0次