1 . 数列
满足:
,
(
≥3),记![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02a75e777db3f4ac6694dd32e1a941c.png)
(
≥3).
(1)求证数列
为等差数列,并求通项公式;
(2)设
,数列{
}的前n项和为
,求证:
<
<
.
![](https://img.xkw.com/dksih/QBM/2014/6/24/1571794857263104/1571794863185920/STEM/98bdfa282f374d1a812caee183f0d81d.png)
![](https://img.xkw.com/dksih/QBM/2014/6/24/1571794857263104/1571794863185920/STEM/427927d46f924ae0a7ad669353588609.png)
![](https://img.xkw.com/dksih/QBM/2014/6/24/1571794857263104/1571794863185920/STEM/b87bf47ad7c14529a047a01390b10ec0.png)
![](https://img.xkw.com/dksih/QBM/2014/6/24/1571794857263104/1571794863185920/STEM/95da5311325e4734925066b82d92b368.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02a75e777db3f4ac6694dd32e1a941c.png)
(
![](https://img.xkw.com/dksih/QBM/2014/6/24/1571794857263104/1571794863185920/STEM/95da5311325e4734925066b82d92b368.png)
(1)求证数列
![](https://img.xkw.com/dksih/QBM/2014/6/24/1571794857263104/1571794863185920/STEM/a1d4b2c1893c4ec9beeea8f3b1be1375.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bca5a8d666201aa5d8764a82c2e54823.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/334297dafc7b398d5eba768ad11410c2.png)
![](https://img.xkw.com/dksih/QBM/2014/6/24/1571794857263104/1571794863185920/STEM/6b7030069542416ebac93478ccf73628.png)
![](https://img.xkw.com/dksih/QBM/2014/6/24/1571794857263104/1571794863185920/STEM/95da5311325e4734925066b82d92b368.png)
![](https://img.xkw.com/dksih/QBM/2014/6/24/1571794857263104/1571794863185920/STEM/6b7030069542416ebac93478ccf73628.png)
![](https://img.xkw.com/dksih/QBM/2014/6/24/1571794857263104/1571794863185920/STEM/3e3ad535a3354dc7bdd9f9da409cd2bc.png)
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2 . 已知数列
的各项都为正数,
.
(1)若数列
是首项为1,公差为
的等差数列,求
;
(2)若
,求证:数列
是等差数列.
![](https://img.xkw.com/dksih/QBM/2014/5/21/1571733368504320/1571733374377984/STEM/67187207efd84de2acd70aab08115d13.png)
![](https://img.xkw.com/dksih/QBM/2014/5/21/1571733368504320/1571733374377984/STEM/302ecf652233473195e54212f3636a4b.png)
(1)若数列
![](https://img.xkw.com/dksih/QBM/2014/5/21/1571733368504320/1571733374377984/STEM/67187207efd84de2acd70aab08115d13.png)
![](https://img.xkw.com/dksih/QBM/2014/5/21/1571733368504320/1571733374377984/STEM/9cf3b411f5ef41eb844a52fb6d575722.png)
![](https://img.xkw.com/dksih/QBM/2014/5/21/1571733368504320/1571733374377984/STEM/cc53dd65dedf4e8cad38e835c4f4e2eb.png)
(2)若
![](https://img.xkw.com/dksih/QBM/2014/5/21/1571733368504320/1571733374377984/STEM/7023c6a656164e55b0a2f64127fbb14f.png)
![](https://img.xkw.com/dksih/QBM/2014/5/21/1571733368504320/1571733374377984/STEM/67187207efd84de2acd70aab08115d13.png)
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名校
解题方法
3 . 设等差数列
的前
项和为
,且
,
,
(1)求等差数列
的通项公式
.
(2)令
,数列
的前
项和为
.证明:对任意
,都有
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d737c1047a14cee12a6671383e244fa5.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/d273b721ae6712ac34be5f8c035b6e21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06c9c905d2ffd48dc7cc966cd1f0e2e8.png)
(1)求等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d737c1047a14cee12a6671383e244fa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0beae565b67319b04e9f55c00a46936e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a89d1f32c1605cfdb8e8855051b9f6ec.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/d726666f99a5a41dd673a2330e377b17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/630b0c1999fadcffe7241a138b8d748a.png)
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2016-12-03更新
|
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4卷引用:江苏省盐城市阜宁东沟高级中学2021-2022学年高三上学期第一次学情检测数学试题
4 . 已知数列
与
满足:
,
,且
.
(Ⅰ)求
的值;
(Ⅱ)设
,证明:
是等比数列;
(Ⅲ)设
证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/412750d71f936969a4762a1d4a44853f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5786daa387797fe28543eb25cdcf0193.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a56f8a9f14dab4bd061ac817a39141be.png)
(Ⅱ)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70cc39555b853b70d8bed0dfadc1d043.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
(Ⅲ)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee87c3ab17dc318846bf75d13d5ddfb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/536929a965b995d88f52a18c93fe03cd.png)
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2016-11-30更新
|
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3卷引用:【全国百强校】江苏省海安高级中学2019届高三12月月考数学试题
5 . 设数列
满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dc1d92f944a81cb293bc6ba129eeed0.png)
(1)求
的通项公式;
(2)设
,记
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dc1d92f944a81cb293bc6ba129eeed0.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/649bef7505f1c29d76cbfe360629ffe0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2916d4549d1d6cb4d1651afedfb319b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5737f1f9cad2471f3ca53241b25a1eb9.png)
您最近一年使用:0次
2016-11-30更新
|
4669次组卷
|
6卷引用:江苏省南京市第一中学2023届高三四模数学试题