已知正项数列
满足
,
,
,
成等比数列,
.
(1)证明:数列
是等比数列;
(2)求
及数列
的通项公式;
(3)若
,求数列
的前n项和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d49b4835c4cd402232ba87fd8a9295d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f6943a61b9827658e4900e6ccb3777e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb03366298b5981e5b4ba4c95be3f047.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfccad57a146113bcf832352b8dd4a5c.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bedad72fdfd668310032ee5fbaa10efa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
更新时间:2022-02-24 09:15:29
|
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解答题-证明题
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适中
(0.65)
真题
名校
【推荐2】已知数列
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【推荐2】已知等比数列
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【推荐1】已知数列
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解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐2】已知数列
是公差不为零的等差数列,
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