名校
1 . 已知数列
满足:
(其中
且
),
为数列
的前
项和.
(1)若
,求
的值;
(2)求数列
的通项公式
;
(3)当
时,数列
中是否存在三项构成等差数列,若存在,请求出此三项;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84e4a6ba8df6cbe80b09da11a40df0bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78fbecca12ee62538020483fd55a2109.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9805d9c45198c7a249f317222f564999.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)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2251391555522aa9598f3c6587c011f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1c3ea872a20fdc1843cb5ffce8a554.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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2 . 已知等差数列{
}的前n项和为Sn,公差d>0,且
,
,公比为q(0<q<1)的等比数列{
}中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0da3dc6065a345f192468df5f441d9eb.png)
(1)求数列{
},{
}的通项公式
,
;
(2)若数列{
}满足
,求数列{
}的前n项和Tn.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82998e334b4dd8a1c285643342598fd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc0b6222a878d450539b2374906a68f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0da3dc6065a345f192468df5f441d9eb.png)
(1)求数列{
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
(2)若数列{
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c59e7c7a84a4bdb959e95536d0404ceb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b812d4eb1cff49beffb2850fd931db2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c59e7c7a84a4bdb959e95536d0404ceb.png)
您最近一年使用:0次
2017-11-22更新
|
649次组卷
|
3卷引用:人教A版(2019) 选修第二册 实战演练 全册综合验收检测
3 . 在数列
,
中,已知
,
,且
,
,
成等差数列,
,
,
也成等差数列.
求证:
是等比数列;
设m是不超过100的正整数,求使
成立的所有数对
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee4464b3b4eb6e52ee02f095aae84f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663bbc5767b9cb453cb08e1f0a8e0602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec26e62d63154f465770cf91e49738c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bfccafa83afe5ee21eab6ef2b2c8852.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b307291317dac187c2f3df1d12268939.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7085d141e33ba0188e58fa2177d89ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cba31e8c939286cafff96e8d715a697.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061ec664220f3983797c17cb152542b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/176c7bb5d8eca67af63f0d6faf2aecf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38a19cc5fcb4d4ddda044e66a8c5cb44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dcf9edea35dd203a8a3631cc4aa1eec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d768f47a34f941657e86df1d42e9f9be.png)
您最近一年使用:0次
2016-12-03更新
|
1150次组卷
|
3卷引用:专题6.5 数列的综合问题(练)-江苏版《2020年高考一轮复习讲练测》
(已下线)专题6.5 数列的综合问题(练)-江苏版《2020年高考一轮复习讲练测》2015届江苏省淮安市高三第五次模拟考试数学试卷【市级联考】江苏省常州市2019届高三上学期期中教学质量调研数学(文)试题
11-12高二上·辽宁沈阳·期中
4 . 已知数列
的首项
(
是常数,且
),![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4fc142a996eda38afaf5544c3620761.png)
,数列
的首项
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61c9c2b3468759a058e0257bfefdf830.png)
.
(1)证明:
从第2项起是以2为公比的等比数列;
(2)设
为数列
的前
项和,且
是等比数列,求实数
的值;
(3)当
时,求数列
的最小项.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/059ae63ecde4c506b519fbeae7fc5878.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0dacc400d55a1a447d426d7a2312f3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4fc142a996eda38afaf5544c3620761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bd048fe3fbd6b0623f146a0ef9021e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67915e2b364c5a92b04d761a3cff50e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61c9c2b3468759a058e0257bfefdf830.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bd048fe3fbd6b0623f146a0ef9021e1.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)设
![](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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846fa57d92d6ad44d6a0cafad1e71ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
您最近一年使用:0次
5 . 已知等比数列{an}满足a4+a8=2,则a6(a2+2a6+a10)的值为________ .
您最近一年使用:0次
名校
6 . 设公差不为零的等差数列
的前
项和为
,且
成等比数列.
(1)求数列
的通项公式;
(2)设
,数列
的前
项和为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92128c6c226ce688bc160fb86854f2fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192a47ab17ed5c588efc6d161889820c.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3b061d3478c4ca323959ab233e20fe3.png)
![](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/fc1f5d407c0e99344ed5f0f5926c5d22.png)
您最近一年使用:0次
2016-12-05更新
|
1148次组卷
|
6卷引用:2017-2018学年第一学期期末复习备考之精准复习模拟题高三年级(文)人教版数学试题(B卷)
(已下线)2017-2018学年第一学期期末复习备考之精准复习模拟题高三年级(文)人教版数学试题(B卷)2017届江苏南通中学高三上期中数学(理)试卷河南省林州市第一中学2018届高三12月调研考试数学(文)试题江西省宜春市第九中学2018-2019学年高二下学期期中考试数学(文)试题福建省尤溪县2018-2019学年普通高中高三上学期半期数学(理)试题山东省济南市外国语学校2020-2021学年高二下学期5月月考数学试题
7 . 等差数列
的第3,7,10项成等比数列,则这3个数的公比q=_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
您最近一年使用:0次
8 . 在某两个正数
,
之间,若插入一个正数
,使
,
,
成等比数列;若插入两个数
,
,使
,
,
,
成等差数列,试比较
与
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc997a4317a3b64369178b27abc44b95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c550b9a7b40513a8f0af9d9ad1978ddb.png)
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2018高三·全国·专题练习
9 . (江苏省兴化市楚水实验学校、黄桥中学、口岸中学三校2018届高三12月联考)数列
为等比数列,
且
成等差数列,则公差![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91742291825d81bef0b1f1d57bb4c241.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
您最近一年使用:0次
名校
10 . 某种设备购买时费用为10万元,每年的设备管理费共计9千元,这种设备的维修费各年为:第一年2千元, 第二年4千元, 第三年6千元,而且以后以每年2千元的增量逐年递增.问这种设备最多使用多少年报废最合算(即使用多少年的年平均费用最少)?
您最近一年使用:0次
2017-12-10更新
|
410次组卷
|
3卷引用:专题16 以基本不等式为背景的应用题-《巅峰冲刺2020年高考之二轮专项提升》(江苏)
(已下线)专题16 以基本不等式为背景的应用题-《巅峰冲刺2020年高考之二轮专项提升》(江苏)广东省中山市第一中学2017-2018学年高二上学期第二次统测数学(理)试题广东省中山市第一中学2017-2018学年高二上学期第二次统测数学(文)试题