设等比数列
的前
项和为
,若
成等差数列,且
,
,其中
,则
的值为_______ .
![](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/c77c91fdcc48a8a9b80dddad022d8cc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b4fd4335319c1e4add40da3ab09d449.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9779b32901eaac36acaf86619bfc8a33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46b6d151d3f864bae873987f6db9327a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0620331265c321c19bc86f418a3e014d.png)
13-14高三·江苏·阶段练习 查看更多[3]
更新时间:2016-12-02 17:35:28
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【推荐1】已知等差数列
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,
,其中
为常数且
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【推荐2】已知等差数列
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解题方法
【推荐1】将杨辉三角中的数从上到下,从左到右依次排列,得数列:1,1,1,1,2,1,1,3,3,1,1,4,6,4,1、…记作数列
,若数列
的前n项和为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cc23c80ad8c14701da935ec94af2f6d.png)
_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
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【推荐2】定义:若数列
满足
,则称该数列为“切线一零点数列”已知函数
有两个零点1,2,数列
为“切线一零点数列,”设数列
满足
,
,
,数列
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________ .
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