已知等比数列
的前
项和为
,若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f0d5f35d87b1dda04a077b830f53326.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45eea5d43f0fc2a0a2d024445ff4e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/819c668a8edb8b523647745d883f0227.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f0d5f35d87b1dda04a077b830f53326.png)
更新时间:2024-05-27 17:42:58
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【推荐1】已知
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成等比数列,则数列
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【推荐2】数列
是单调递_________ (填“增”或“减”)数列,该数列的前
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67f55d39c6a90a2f79724abb0614e22e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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【推荐1】中国古代数学著作《算法统宗》中有这样一个问题:“三百七十八里关,初行健步不为难,次日脚痛减一半,六朝才得到其关,要见次日行里数,请公仔细算相还.”其意思是“有一个人走378里,第一天健步行走,从第二天起脚痛每天走的路程是前一天的一半,走了6天后到达目的地.”请问前三天走了______ 里.
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【推荐2】古代数学著作《九章算术》有如下问题:“今有女子善织,日自倍,五日织五尺,问日织几何?”意思是:“一女子善于织布,每天织的布都是前一天的2倍,已知她5天共织布5尺,问这女子每天分别织布多少?”根据上题的已知条件,该女子第二天织布___________ 尺?
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