已知数列
满足
.
(1)求数列
的通项公式;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b2cc1095ffa20e537b02de51e2bc45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa6c6c7b0a9bd1e6152dc6cac19d3d60.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af066253a251329e6024eb5a1a39f9a3.png)
2020·全国·模拟预测 查看更多[4]
(已下线)2021年浙江省高中名校名师原创预测卷数学(第八模拟)(已下线)大题专项训练12:数列(证明不等式)-2021届高三数学二轮复习(已下线)一轮复习大题专练35—数列(证明不等式2)-2022届高三数学一轮复习(已下线)专题16 数列放缩证明不等式必刷100题-【千题百练】2022年新高考数学高频考点+题型专项千题百练(新高考适用)
更新时间:2021-01-13 16:52:22
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解答题
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解题方法
【推荐1】在数列
中,有
,证明:数列
为等差数列,并求其通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eba464a94fd34335418fa4bc4feb8f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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解答题-问答题
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适中
(0.65)
名校
【推荐2】已知正项数列
的前n项和为
,对于任意的
,都有
.
(1)求
,
;
(2)求数列
的通项公式;
(3)令
问是否存在正数m,使得
对一切正整数n都成立?若存在,求出m的取值范围;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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9740067d6783eb8c90ac641a5e297e48.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(3)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943e59d120a4f6c73c2552a7f692951a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fcf3941f65d406fff35c41e77de58.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】数列
中,
,
,数列
满足
.
(1)求数列
中的前四项;
(2)求证:数列
是等差数列;
(3)若
,试判断数列
是否有最小项,若有最小项,求出最小项.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14835bf3f00139ccec0694d0924db795.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f755aa1e155c69f2cfa5b24aebec708.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88d48868b259993d0000b7c47525ebcb.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/577048d392e432e576fae1337314495a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
您最近一年使用:0次
【推荐2】已知数列
满足
,且对任意的正整数
,总有
.
(1)求
;
(2)设数列
的前
项和为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa01f03fb074bff35b35e07047d11b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efe64597bda851cd982014b18f8436b6.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)设数列
![](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/72a649e3797ffb353cf2e0f70cf70a82.png)
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适中
(0.65)
名校
【推荐2】已知数列
满足
,
.
(1)若
为不恒カ0的等差数列,求
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(2)若
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7fab51121848ce166035ceab6f4e00b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0568411c5212c62aeb54576daa2719e.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dd82b5223c2a708c1729db2a3750990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8804fde1b74eaeb7d8979ca17a6fba0.png)
您最近一年使用:0次