解题方法
1 . 已知等差数列
的公差
,其前
项和为
,且
,
,
成等比数列.
(1)求数列
的通项公式;
(2)若
,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/7bb07ff7abafb42429a1cd54365d2cdc.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/58b3175ab6772cd611f9c42771a9467d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f30f56664446f32dbbc2c5f12a99374.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e99dbc4c4941ade5d563f8482be3ec11.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/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b561dc2a176625431fe856f5c6dca3e7.png)
您最近一年使用:0次
2 . 已知数列
为等差数列,且
,
.
(1)求数列
的通项公式;
(2)若
(
),
是
的前
项和,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cf1da18d91f7c98086553d157d1a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10a27ee67f4016a48492a614ea2dc774.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fb9ab8404000c6992e7451dbbac2a5b.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19a2bc2f9cfcd0c89c48bcaf044920ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1505d56f0b35fe7f2de1fe1888036e4c.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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c74faf91e25a88e9aa2f111ae3e26a9.png)
您最近一年使用:0次
2017-12-04更新
|
843次组卷
|
2卷引用:河南省中原名校(即豫南九校)2017-2018学年高二上学期第二次联考理数试题
名校
解题方法
3 . 已知在公差不为零的等差数列
中,
和
的等差中项为11,且
,其前
项和为
.
(1)求
的通项公式
;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65fc200f10b97588a0c9896277c9c64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fd71bc7e6668f90f259ad0b06dd60c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b5700793f4edc36f2f5f1915ca67507.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/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71a0d90ad3fa51db5e90075798ed5f87.png)
您最近一年使用:0次
2017-11-14更新
|
652次组卷
|
2卷引用:河南省南阳市八校2017-2018学年高二上学期期中联考数学(理)试题
名校
解题方法
4 . 已知等差数列
的公差大于0,且
是方程
的两根,数列
的前
项的和为
,且
.
(1)求数列
,
的通项公式;
(2)记
,求证:
;
(3)求数列
的前
项和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eedd5b5ba81010aa9f45afbe62fa77e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/623a7c85a642d4a0fe7b2459be36512a.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/77e4de0158cef7ee3f9b3e36f38a54d2.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9221c0c92a526f65533cdc5400767af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6181efc8da38375fb0fe04dc8f54d757.png)
(3)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
2017-12-02更新
|
541次组卷
|
3卷引用:广西桂林中学2017-2018学年高二上学期期中考试数学(理)试题
解题方法
5 . 设数列
的前
项积是
,且
,
.
(1)求证:数列
是等差数列;
(2)设
,求数列
的前
项和
![](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/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e035d90d2bae412d20de7ed27fbdeb1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/352d9b76dcf639368fa68cae70149802.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6874a88fb85ab327d39c12a35c5252f0.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a016a9fb2cce853b43f687af5d55.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/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
13-14高一下·河北石家庄·期中
名校
6 . 已知等差数列{an}的前n项和为Sn,且a2=1,S11=33.
(1)求{an}的通项公式;
(2)设
,求证:数列{bn}是等比数列,并求其前n项和Tn.
(1)求{an}的通项公式;
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7e6e2e198904f054456646f4352aa3b.png)
您最近一年使用:0次
解题方法
7 . 在等差数列
中,
,
,其前
项和为
.
(1)求数列
的通项公式;
(2)求数列
的前
项和
,并证明
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c2da0f91784e6bf9963c668b4fc61e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1928c254cfada1f75a5cd1e34db5a63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8050391385b496e9c059201e4f12600a.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/c215db1d8f69757118ad405b78035628.png)
您最近一年使用:0次
2017-11-28更新
|
715次组卷
|
2卷引用:河南省某重点高中2017-2018学年上学期高二期中考试数学(理)试卷
11-12高二上·湖南湘西·阶段练习
8 . 设数列
的前
项和为
,且
;数列
为等差数列,且
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96008cebfce08da2703bb0ecef7097c3.png)
(I)求数列
的通项公式;
(II)若
,
为数列
的前
项和,求证:
![](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/8ecd8203c2dde0baed652dbaeb0e0423.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db2c97f55d9ffac66e05017b38c05b9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96008cebfce08da2703bb0ecef7097c3.png)
(I)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(II)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ec5f6a927c14f93a9a2bc24b96acf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.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/a0cb2eb96749f942405162047de63664.png)
您最近一年使用:0次
名校
9 . 已知公差不为零的等差数列
,满足
成等比数列.
(Ⅰ)求数列
的通项公式;
(Ⅱ)若
,数列
的前n项和为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc145578a0183ba4d80b10c072b7f188.png)
(Ⅰ)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5d787a9e10d72bba6e3003db3a2dd35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af4745c3a29a66285e380c867bd2dc99.png)
您最近一年使用:0次
2016-12-03更新
|
553次组卷
|
2卷引用:湖南省长沙市第一中学2021-2022学年高二上学期12月第二次阶段检测数学试题
真题
名校
10 . 设
是首项为
,公差为
的等差数列(
),
是前
项和. 记
,
,其中
为实数.
(1)若
,且
,
,
成等比数列,证明:
;
(2)若
是等差数列,证明
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/812be9806122241c476ba1db516c4823.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa50ba02896fb190ab6dc25bc529bc73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a783088120d67cc98936081e80fb7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b715e7842b95f654f16056a7c7f2abe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13423c094861baf4b759b7f3d8c3c226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a548938d87c80ac47910607d3857007f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72b5247f5373c52fe795e2f0418ded69.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a783088120d67cc98936081e80fb7f.png)
您最近一年使用:0次
2016-12-02更新
|
2773次组卷
|
10卷引用:沪教版(上海) 高二第一学期 新高考辅导与训练 第7章 数列与数学归纳法 7.2(3)等差数列的前n项和
沪教版(上海) 高二第一学期 新高考辅导与训练 第7章 数列与数学归纳法 7.2(3)等差数列的前n项和(已下线)4.1等差数列及其通项公式(第1课时)(作业)(夯实基础+能力提升)-【教材配套课件+作业】2022-2023学年高二数学精品教学课件2013年全国普通高等学校招生统一考试数学(江苏卷)(已下线)2014届高考数学总复习考点引领+技巧点拨第五章第6课时练习卷(已下线)2013-2014学年江西省吉安一中高一下学期第一次段考数学试卷江苏省张家港市崇真中学2017届高三上学期寒假自主学习检测数学试题苏教版高中数学 高三二轮 专题21 数列的综合应用 测试(已下线)专题18 等差数列与等比数列-十年(2011-2020)高考真题数学分项(已下线)专题33 算法、复数、推理与证明-十年(2011-2020)高考真题数学分项(八)(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》