名校
1 . 若数列
是等差数列,
,满足
,且
,则数列
的通项公式为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6574b44a3f8e46d987efd602f98ada93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cabe8a74ff165189787a700857acf64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3ff57a2cd32a8a6beaa8dc62dac0536.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
您最近一年使用:0次
2020-01-30更新
|
419次组卷
|
3卷引用:甘肃省民乐县第一中学2021-2022学年高三上学期10月诊断考试数学(理)试题
名校
2 . 等差数列
的前n项和为
,若
,
,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/235afd2013493efeddc5a9cea81046ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd478b1ba0e42545b45d505e2e84a140.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65fc200f10b97588a0c9896277c9c64.png)
A.12 | B.15 | C.18 | D.21 |
您最近一年使用:0次
2019-04-24更新
|
1598次组卷
|
5卷引用:甘肃省高台县第一中学2021-2022学年高三上学期第二次检测数学(文)试题
14-15高三上·云南玉溪·阶段练习
名校
3 . 已知数列
与
,若
且对任意正整数
满足
数列
的前
项和
.
(1)求数列
的通项公式;
(2)求数列
的前
项和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13a6e1d671215fc96e4bee3541d1096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f9f8f3fa8271aa7559ea9f0a9f95053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/636aae0f9abe37980e10e9922da2d915.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942ed174dfdafaf5f0a68cac579110f8.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da72309d2507e2f5e5ed88d8cc08963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68eee81e090b96819b7df54fc1bcc3a6.png)
您最近一年使用:0次
2018-10-13更新
|
628次组卷
|
6卷引用:2017届甘肃省肃南裕固族自治县第一中学高三上学期期末考试数学(文)试卷
2017届甘肃省肃南裕固族自治县第一中学高三上学期期末考试数学(文)试卷(已下线)2015届云南省玉溪一中高三上学期第一次月考文科数学试卷(已下线)2015届黑龙江省哈尔滨市六中高三上学期期中考试理科数学试卷2015届河南省信阳市高中毕业班第二次调研检测文科数学试卷【全国百强校】黑龙江省双鸭山市第一中学2019届高三上学期第一次月考数学(理)试题江西省赣州市八校2020-2021学年高一下学期期中联考数学试题
解题方法
4 . 已知数列
,
,数列
是公差为1的等差数列,点列
在直线
上,
为
与
轴的交点.
(1)求数列
的通项公式;
(2)若
,令
,试写出
关于
的表达式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e09cfe4983dcb85e3db4cd09bfa4e55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9944bcd0c383c1d3d04c6ab90cacced9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a46abeaeed1bc3c1e0f852bcc4e74630.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17445c68424ae4987080b4d6723b4f9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
解题方法
5 . 已知数列
的各项为正数,其前
项和为
满足
,设
.
(1)求证:数列
是等差数列,并求
的通项公式;
(2)设数列
的前
项和为
,求
的最大值.
(3)设数列
的通项公式为
,问: 是否存在正整数t,使得
成等差数列?若存在,求出t和m的值;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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71e3fada69fbdbf095b43d1367df81bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9f2a118078a2b40285bbfa38d71ff7a.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设数列
![](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/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
(3)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8bb3d881b0b0c328f4c2cfa55e54a25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f401b2388e91b87ddc12aacf25f1b342.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5659565f5638ab4609a7edc252370039.png)
您最近一年使用:0次
解题方法
6 . 已知正项数列
的前
项和为
,且
,数列
满足
,且
.
(1)求数列
的通项公式;
(2)记
,求
.
![](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/43ccfacd222c695ec1e24b9747c88e5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd4c503f20a4a701f0c07f8289613f35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd6c97d2ee3e74ba5730f1cbcc1d43.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e567d7e9761951a266953c8d5042ac.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2d68faecbac016f862147dc4d0ef983.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
2016-12-04更新
|
421次组卷
|
4卷引用:2017届甘肃肃南裕固族自治县一中高三文12月月考数学试卷
10-11高二·辽宁铁岭·阶段练习
名校
7 . 数列
满足
,则
等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/086e9b14c35ef3c57b20f5e952ebf9c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30172ee7296af26bd410968ec2783083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3282e5fde4ae53fcb1bb072a685304c9.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2011-10-28更新
|
1123次组卷
|
6卷引用:甘肃省民乐县第一中学2020-2021学年高三上学期1月诊断考试数学(理)试题