名校
解题方法
1 . 已知等差数列
的公差为2,且
,
,
成等比数列.
(1)求数列
的通项公式;
(2)设数列
的前n项和为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e6f19b84484b5480ea2100165abfd81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2a3f1efb02f25a63745a175135b7657.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e6603814ac39b169453607671158d3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1fa62547035003b5751493e05db2e24.png)
您最近一年使用:0次
2018-11-16更新
|
482次组卷
|
3卷引用:广东省深圳市红岭中学2022-2023学年高二上学期期末数学试题
名校
2 . 已知等差数列
的前n项和为
,且
,
.
(1)求
;
(2)设数列
的前n项和为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47dce0a1fe55239f8017915d53669ecb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/489b9ce1996ce5101624f75a757f72fd.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad83668ff336589f82a2cd04db9f9947.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
2018-11-11更新
|
3885次组卷
|
17卷引用:【校级联考】辽宁省实验中学、大连八中、大连二十四中、鞍山一中、东北育才学校2018-2019学年高二上学期期末考试数学(文)试题
【校级联考】辽宁省实验中学、大连八中、大连二十四中、鞍山一中、东北育才学校2018-2019学年高二上学期期末考试数学(文)试题【校级联考】辽宁省实验中学、大连八中、大连二十四中、鞍山一中、东北育才学校2018-2019学年高二上学期期末考试数学(理)试题安徽省合肥市一中、合肥六中2018-2019学年高一下学期期末联考数学试题四川省宜宾四中2019届高三上学期期末数学(文)试题【市级联考】四川省资阳市2019届高三第一次诊断性考试数学(理)试题【市级联考】四川省资阳市高中2016级第一次诊断性考试(数学文)【全国百强校】四川省棠湖中学2019届高三上学期第三次月考数学(文)试题【全国百强校】四川省棠湖中学2019届高三上学期第三次月考数学(理)试题【全国百强校】河北省武邑中学、景县中学2019届高三上学期联考数学(文)试题【全国百强校】河北省武邑中学2019届高三下学期第一次质检数学(文)试题【市级联考】河南省六市2019届高三第二次联考数学(文)试题2020届吉林省梅河口市第五中学高三下学期模拟考试数学(文)试题四川省雅安中学2019-2020学年高一4月月考数学试题江西省赣州市赣县第三中学2019-2020学年高一下学期期中考试数学试题江西省吉安市白鹭洲中学2021届高三年级上学期期中考试数学(理科)试题江西省兴国县第三中学2020-2021学年高一下学期期中考试数学试题云南省昭通市昭阳第一中学2020-2021学年高一12月月考数学(文)试题
3 . (1)证明:1,
,
不可能成等差数列;
(2)证明:1,
,
不可能为同一等差数列中的三项.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
(2)证明:1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
您最近一年使用:0次
4 . 等差数列
中,
,
,其前
项和为
.
(1)求数列
的通项公式;
(2)设数列
满足
,其前
项和为为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab75d3122b996fdef76da828c353d0fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356934c639eed8cfd278d21e04dc82ae.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)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/452cdee6631e435e2b4994e0800b2b7c.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/c2908e20671ad6dcab1e56409dc0ed45.png)
您最近一年使用:0次
2018-02-23更新
|
708次组卷
|
2卷引用:河南省豫南九校17-18学年高二上学期期末联考理科数学试题
名校
解题方法
5 . 已知公差不为零的等差数列
满足:
,且
是
与
的等比中项,
(1)求数列
的通项公式;
(2)设数列
满足
,
的前
项和为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bb9a10fb4c527e66cff264ea2aee84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65fc200f10b97588a0c9896277c9c64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46be9c9b05fd84ac9256d49a5a553af5.png)
(1)求数列
![](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/216876de04325fd250c38c485cbc34b7.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
解题方法
6 . 已知正项数列
的前
项和为
,对任意
,且
.
(1)证明:数列
为等差数列,并求数列
的通项公式;
(2)若
,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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e5b17d9c4d5ef072196c7637841ed4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1dfe5b322577f02fd19caab8cf20170.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/216876de04325fd250c38c485cbc34b7.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)
您最近一年使用:0次
解题方法
7 . 已知等差数列
的各项互不相等,前两项的和为10,设向量
,且
.
(1)求数列
的通项公式;
(2)若
的前
项和为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37f4018eedc35bfcfc8ad3a1902eef29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d0fdc271e4511ee0ba03495ede2284.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f72c413ed9091a9cfb58afdaa596c227.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/38bd70d785ad51a9a435d6d0f3e4769e.png)
您最近一年使用:0次
2010·河北邯郸·二模
解题方法
8 . 设数列
为等差数列,且
,
,数列
的前
项和为
,
且
;
(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/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://img.xkw.com/dksih/QBM/2010/7/3/1569778210455552/1569778215682048/STEM/a86a0e5e28e54071aeda57ea59d5627c.png?resizew=52)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96008cebfce08da2703bb0ecef7097c3.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/c73e06605cc93d9844b02ca51e90433e.png)
![](https://img.xkw.com/dksih/QBM/2010/4/26/1569704590516224/1569704596168704/STEM/a99c37530fc045c1a150d1e737b81f6d.png?resizew=179)
(Ⅰ)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f46c4e3c379e5d8516494d6ff3caef58.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/9ed5b54a11649a1ff4b335a141b420d9.png)
您最近一年使用:0次