正项等比数列
,若
,
,则
的值为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afbfd6b761451716ba3d7130c93497ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32df333ec0e98d41112a262b077a0f59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
2022·宁夏石嘴山·三模 查看更多[2]
更新时间:2022-05-22 17:08:02
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【知识点】 等比数列通项公式的基本量计算
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【推荐1】已知数列
满足
,
,现有如下四个结论:
①
;
②
中各项均为奇数;
③
能被7整除;
④数列
的前
项和为
.
其中所有正确结论的序号是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2693734765399876e9e93cdb110231c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e38f45c76c7ca5ac96fbd4af020e4292.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd9c2acdc717f076d579cdd9d189c39d.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e35eeaabd951fb09b2926807da3685b.png)
④数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8f9dbca73e8d9cb319cdcb8b2d78ba9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af496e1c2fe52e56a3846e5922edc06a.png)
其中所有正确结论的序号是
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