1 . 设
是数列
的前
项和,已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4775854d3c2fd897b6799b14201e9e89.png)
(1)求
,并证明:
是等比数列;
(2)求满足
的所有正整数
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](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/4775854d3c2fd897b6799b14201e9e89.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faf6a6abc3a6abef29b943543e92f7ee.png)
(2)求满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cd756ad895dc5bf3dfd98622bc60eb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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2 . 等比数列{an}中,公比q=3,S80=32,则a2+a4+a6+…+a80=________ .
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2018-02-24更新
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561次组卷
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3卷引用:福建省宁德第一中学2023-2024学年高二上学期10月学科素养数学试题