1 . 等比数列
中,
,
,则公比为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14aad424d93f93c00f84ce6b5ffd56e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/097899de76881cab57ae4f6409662061.png)
A.![]() | B.2 | C.![]() | D.4 |
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解题方法
2 . 设各项非负的数列
的前
项和为
,已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1446b925ca42b708ad2a162040bf874.png)
,且
成等比数列.
(1)求
的通项公式;
(2)若
,数列
的前
项和
.
![](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/e1446b925ca42b708ad2a162040bf874.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69d307ec71820b6536453fbdb5069da3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07ad29870419d1ca48b69c128fd18b79.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7af81b8983a36debb3c1f6339a6eeef0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
2022-03-29更新
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