在①
,②
,③
三个条件中选择一个条件,补充在下面的问题中,并加以解答.
在正项等比数列
中,
,
,
,且___________.
(1)求数列
的通项公式;
(2)求数列
的前n项和
.
注:如果选择多个条件分别解答,按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01f84445aa12c499a9519f52be72199a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b09fd4b49967b90a17a91ad033140c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/565df9f3c0872c53de218f7b966df229.png)
在正项等比数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e821abe47df8a12c87b58acb9569f30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8263ce061c41c0d5101c2d88536442a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7be9c7a99a01197033fdf9ac6740279.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
注:如果选择多个条件分别解答,按第一个解答计分.
更新时间:2022-01-27 10:05:20
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【推荐1】给出以下三个条件:①
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