已知等比数列
的前
项和为
,若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc4e70b360f988fdbd92300ab22c4613.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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ccdc17b603871d20843ffccca2df0ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56140bbefc437f5f83f47038a9a90df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc4e70b360f988fdbd92300ab22c4613.png)
更新时间:2020-05-01 07:18:48
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【知识点】 等比数列片段和性质及应用
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【推荐1】已知正项等比数列
的前
项和为
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74d14e507b433407593574b34ed763ff.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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ccc810f415152c2282937bbf868d9f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74d14e507b433407593574b34ed763ff.png)
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【推荐2】《九章算术》第三章“衰分”介绍比例分配问题:“衰分”是按比例递减分配的意思,通常称递减的比例(百分比)为“衰分比”.如:甲、乙、丙、丁“衰”得100,60,36,21.6个单位,递减的比例为40%,今共有粮
(
)石,按甲、乙、丙、丁的顺序进行“衰分”,已知丙衰分得80石,乙、丁衰分所得的和为164石,则“衰分比”为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
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