已知数列
满足
,若
,则
的值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebba9bf071843adb1a08bbdb497de1df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70d5a615f0c063286d838e5954ef2d1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
更新时间:2023-07-25 13:34:59
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【推荐1】已知数列
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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】已知
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【推荐2】我国古代数学名著《算法统宗》中有如下问题:“远望巍巍塔七层,红光点点倍加增,共灯三百八十一,请问尖头几盏灯?”原文意思是:一座7层塔共挂了381盏灯,且相邻两层中的下一层灯数是上一层灯数的2倍,问塔的顶层有多少盏灯?若塔的最中间一层有n盏灯,则n=_____ .
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