已知数列
的前n项和为
,满足
,
.
(Ⅰ)求
的通项公式;
(Ⅱ)设
为数列
的前n项和,求证:对任意
,都有
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f58acbf92cdc22e0df525949d1ae082.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(Ⅱ)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb8605b068a6d18f5574eff9279f4809.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3819480e1e624208f729ad8653e4f24f.png)
20-21高三上·浙江温州·期末 查看更多[3]
浙江省温州市2020-2021学年高三上学期期末数学试题(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)第23讲 证明数列不等式-2022年新高考数学二轮专题突破精练
更新时间:2021-02-02 18:06:07
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(1)若
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(2)若数列
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,
,且
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(1)若
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(2)若数列
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e9140a6eb7d00592a39355ad7b19284.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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【推荐2】已知
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(1)证明:
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(2)用
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(3)求四边形
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解答题-问答题
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解题方法
【推荐1】已知
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a11e8e9e4435b5610c8a9ae3a432c6a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
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(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46c39b984e70553acb2da1012e26ba36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38fcec7af3520884b173b29bda6c657a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/709e04d61896621195fdb64e552de472.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
(3)记
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【推荐2】已知数列
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,
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,
,
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)成等比数列,
.
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的通项公式;
(2)令
,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67a2fc7063bcdce2bee4cb0f4d748d72.png)
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(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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(2)令
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您最近一年使用:0次
解答题-证明题
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较难
(0.4)
解题方法
【推荐1】已知数列
的首项
,其前n项和为
,对于任意正整数
,都有
.
(1)求数列
的通项公式;
(2)设数列
满足
.
①若
,求证:数列
是等差数列;
②若数列
都是等比数列,求证:数列
中至多存在三项.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/381576e698a46df8c497e6b5f8346ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b708c8dcb2d66eb2ce0b3718a9cd924a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/617f6ed8d7ce5c38c0c2b886029a339b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/265f2123abd6aa72a45c0f1a242eda0f.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75ec46a358de830de6459ec829ceeb2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ce17985f5c7e140572d8324cb78e63a.png)
①若
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②若数列
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【推荐2】已知数列
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(1)求数列
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(2)求数列
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(3)求数列
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