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1 . 等比数列{
}的前n项和为
,已知对任意的
,点
,均在函数
且
均为常数)的图像上.
(1)求r的值;
(11)当b=2时,记
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3d37b5625feea3fb5861dc29a62bde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/184a6d327a0d8ee359e74c2c5e2f257e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cadca19db1dd00783a9df6a1a240199c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a3c20da46c7c6138812334f1404deb8.png)
(1)求r的值;
(11)当b=2时,记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55b19e1b9a46ad1a48c1d7758ccc17d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a89d1f32c1605cfdb8e8855051b9f6ec.png)
![](https://img.xkw.com/dksih/QBM/2010/3/12/1569631062581248/1569631152889856/STEM/067dadc69d7b423dbee34f3db7cd2528.png)
![](https://img.xkw.com/dksih/QBM/2010/3/12/1569631062581248/1569631152889856/STEM/c6b61ceceec947d29762df708f563222.png)
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2019-01-30更新
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9卷引用:四川省乐山外国语学校2018届高三上(理)练习题(三)数学试题
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2 . 已知数列
的前
项和为
,且满足
.
(1)求证:数列
为等比数列;
(2)已知
,求数列
的前
项和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.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/0df387df5d97ffab16c92b6f6c0f7728.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82f8b6edfb7d680d88ed991d5c552c43.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1e8a0503abebc7b0f2a60b2ec15d282.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f329b217e1051b23f0d61023cdc6e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次