已知正项等比数列
的前
项和为
,.若
,且
.则
=________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b708c8dcb2d66eb2ce0b3718a9cd924a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea21baa27fe6571dc6f018a744a91e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fc3723958970eb2510a6bb8ed4ccf10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
更新时间:2018-07-18 14:51:49
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解题方法
【推荐1】正项等比数列
中,若
,则等比数列
的公比的取值范围是 ;
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【推荐2】已知数列
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____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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【推荐1】等比数列
前项
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_________ .
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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【推荐2】已知等比数列
的前
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,
,则
的值是__________ .
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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