已知等比数列
中,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ebce85ea9bc18815ef8887057030a63.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d0e613ac9c1b3ede716948a0188b95e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22c5c4ac959eb2c4b74afabc9cdd3a6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ebce85ea9bc18815ef8887057030a63.png)
更新时间:2023-03-09 14:27:02
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填空题-单空题
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【推荐1】在等比数列
中,
,且公比
,则
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2d2f08b37a21961901f1813b1872805.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eda6dc559d07bc22c9a0ed1e3a6d01d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfc875ca919921e8f63a6fca648561b.png)
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【推荐2】设等比数列
的公比为
,其前
项和为
,若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56c92910ae62f7b348e0a4228f795f85.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.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/55783ca5e51e1528f2f8f17f6765da55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b15312a32d7104c4ef5a0a3b43d5a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56c92910ae62f7b348e0a4228f795f85.png)
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填空题-单空题
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【推荐1】在9与243中间插入两个数,使它们同这两个数成等比数列,则这两个数为________ .
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解题方法
【推荐2】若等比数列
的前n项和
,则常数k的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da501176d1f9526c42dc59df404511da.png)
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