11-12高三上·湖北黄冈·阶段练习
1 . 设数列
的前
项和为
,且
;数列
为等差数列,且
.
(1)求数列
的通项公式;
(2)若
,n=1,2,3,…,
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/4c6ad4b0d84b4733aaaa7e35e2a0a076.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80947c29738312a84f09950f3098c1e0.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9221c0c92a526f65533cdc5400767af.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/60f64ba0d54562f1116d869910490ccb.png)
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解题方法
2 . 设等差数列
的前
项和为
.且
.
(1)求数列
的通项公式;
(2)令
,数列
的前
项和
,证明:对任意
,都有
.
![](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/cb6729e3fed1afd45e8b52bfa8fee8bb.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b11849b4064846173587dda13276dda.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/48f093c61867ee4ce75f951d46b9b123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3b251e07a6f3d915290b1fe52e1654.png)
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3 . 已知公差不为零的等差数列
,满足
,且
成等比数列.
(1)求数列
的通项公式;
(2)设
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f5a39d8445aa4b263b285906c6e86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62b3d2cc886c68ce0716a1b9c476f558.png)
(1)求数列
![](https://img.xkw.com/dksih/QBM/2015/6/16/1572127128469504/1572127134539776/STEM/37524ecbc1c64ad98192c0b16e886f34.png?resizew=31)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48900296ad3ea9c92578de3b58e8445f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9389e904d728eb9cffeb4c5e865fab22.png)
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解题方法
4 . 设等差数列
的前
项和为
,且
(
是常数,
),
.
(1)求
的值及数列
的通项公式;
(2)证明:
.
![](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/3298870a98a8b15946a4cd8750bb5733.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/361386446d504a14471b9fd89130f1c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a82250affdcd1bee968268d0e3b37d19.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024162cd10cb65433782761ae88cf446.png)
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11-12高三下·浙江台州·阶段练习
5 . 设等差数列{an}的首项a1为a,公差d=2,前n项和为Sn.
(Ⅰ) 若S1,S2,S4成等比数列,求数列{an}的通项公式;
(Ⅱ) 证明:
n∈N*, Sn,Sn+1,Sn+2不构成等比数列.
(Ⅰ) 若S1,S2,S4成等比数列,求数列{an}的通项公式;
(Ⅱ) 证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49dac463bbb7375dbf8e2246f9a6f0d9.png)
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2012·浙江台州·一模
6 . 设等差数列{an}的首项a1为a,公差d=2,前n项和为Sn.
(Ⅰ) 若S1,S2,S4成等比数列,求数列{an}的通项公式;
(Ⅱ) 证明:
n∈N*,Sn,Sn+1,Sn+2不构成等比数列.
(Ⅰ) 若S1,S2,S4成等比数列,求数列{an}的通项公式;
(Ⅱ) 证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49dac463bbb7375dbf8e2246f9a6f0d9.png)
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2011·北京朝阳·一模
名校
解题方法
7 . 有
个首项都是1的等差数列,设第
个数列的第
项为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d1d7ef1fb13d2aec20027314e923b89.png)
,公差为
,并且
成等差数列.
(Ⅰ)证明
(
,
是
的多项式),并求
的值
(Ⅱ)当
时,将数列
分组如下:
(每组数的个数构成等差数列).
设前
组中所有数之和为
,求数列
的前
项和
.
(Ⅲ)设
是不超过20的正整数,当
时,对于(Ⅱ)中的
,求使得不等式
成立的所有
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d1d7ef1fb13d2aec20027314e923b89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85cdebb11f93ac0ac96405cb13387fb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee8598379ec01edc16c72c1d3fa3ce81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/384e7b2dd4a6a05076bd107fc56e79cf.png)
(Ⅰ)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2470082d0a6aa317030c6904f438c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615b5e9149cb77ee71a4684bfd43e98a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3c5a4887dfe02b02ee90d740151e1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cca4b2f545d6cfd6764ad19c7bc2c2f8.png)
(Ⅱ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/668345e071ce304544f740f3acf2f94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/463195d16c135c5aea8fc05fa74a5273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d1f40fcb8cd5e6941f2d802812a4681.png)
设前
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3bac79423bb2a687f6b0ba5dc26d602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb7b05a076e75ba6ca76e758a590e9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(Ⅲ)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1563da7b0f046a469476668a3686e8f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7117b31d02b57786c7c4eea04e26920.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
您最近一年使用:0次
名校
解题方法
8 . 已知
是等差数列,其前
项和为
,
是等比数列,且
,
,
.
(Ⅰ)求数列
与
的通项公式;
(Ⅱ)记
,
,证明
(
,
).
![](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/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c5a7a17a394e868e0acd1803a9ab795.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da00560d18f576a37bcc21459698145f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b224a65a8f2d495d327e4a488c0dba1.png)
(Ⅰ)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
(Ⅱ)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f4ed9d2c4f561c118ad7581fda564bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26e98a2cb8bcf8604c83b02e78693eff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9153fb853cd99beec9e600a4eaf73fe8.png)
您最近一年使用:0次
2016-12-05更新
|
595次组卷
|
3卷引用:2017届山西孝义市高三上学期二轮模拟数学(文)试卷
解题方法
9 . 设数列
的前
项和为
,已知
.
(1)求
的值,并求数列
的通项公式;
(2)若数列
为等差数列,且
,
.设
,数列
的前
项和为
,证明:对任意
,
是一个与
无关的常数.
![](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/2a949de98f4a687d4cbc5f8f748117a3.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34a0e2133efdfa65dcb4f925a6eac33b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a014bfab69a113e80dd40d72af8dc9d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9221c0c92a526f65533cdc5400767af.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/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1933b7c3ace69622339353431c519b13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea31accf763fcbe0384ce37f1fbb8ed8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
2016-12-03更新
|
426次组卷
|
3卷引用:2016届湖南师范大学附中高三上学期月考三文科数学试卷
10 . 已知等差数列
中,![](https://img.xkw.com/dksih/QBM/2015/10/28/1572273900298240/1572273906089984/STEM/d288181c8f6b4fccb2a6c09f8369264a.png)
.
(1)求数列
的通项公式;
(2)令
,证明:
.
![](https://img.xkw.com/dksih/QBM/2015/10/28/1572273900298240/1572273906089984/STEM/4c04cdbf7d774c6ea5804631693b202c.png)
![](https://img.xkw.com/dksih/QBM/2015/10/28/1572273900298240/1572273906089984/STEM/d288181c8f6b4fccb2a6c09f8369264a.png)
![](https://img.xkw.com/dksih/QBM/2015/10/28/1572273900298240/1572273906089984/STEM/ff892ab8d6834cc0b0176c834d130b2d.png)
(1)求数列
![](https://img.xkw.com/dksih/QBM/2015/10/28/1572273900298240/1572273906089984/STEM/4c04cdbf7d774c6ea5804631693b202c.png)
(2)令
![](https://img.xkw.com/dksih/QBM/2015/10/28/1572273900298240/1572273906089984/STEM/7c65416e4b4e48c1a69dbe7e826b7eb2.png)
![](https://img.xkw.com/dksih/QBM/2015/10/28/1572273900298240/1572273906089984/STEM/607b31b2f40c435b86bb25ffa36e938c.png)
您最近一年使用:0次
2016-12-03更新
|
1126次组卷
|
2卷引用:2016届宁夏银川市二中高三上学期统练二理科数学试卷1