在等差数列
中,前
项和为
,若
,则
的值为_______ .
![](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/8b1d3a06ee3a948a439f482794c8540c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39d8594f325bb1c5d0f7e1080d32fa11.png)
更新时间:2024-01-17 19:55:28
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【推荐1】已知等比数列
的前
项和为
,
,且
,
,
成等差数列,则
的值是____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
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【推荐2】已知
是等比数列
的前
项和,
,
,
成等差数列,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0382b4a2ab0657d2d6830bb6be2b17b6.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.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/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05201ef79a5d5904f492845396fb5470.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a48e81b54f78b96294295542b010dfb.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0382b4a2ab0657d2d6830bb6be2b17b6.png)
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【推荐1】等差数列
的前
项和为
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfc875ca919921e8f63a6fca648561b.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/f2fcd86b9ed6819116a261629f96fae1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfc875ca919921e8f63a6fca648561b.png)
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解题方法
【推荐2】我国的《洛书》中记载着世界上最古老的幻方:将1,2,…,9填入方格内使三行、三列、两条对角线的三个数之和都等于15,如图所示.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/9d7e591c-fbf2-4dd9-9468-894edcfbc43f.png?resizew=258)
一般地,将连续的正整数1,2,…,
填入
个方格中,使得每行、每列、每条对角线上的数的和相等,这个正方形叫做
阶幻方.记
阶幻方的对角线上数的和为
,例如
,
,
,……,那么![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bd0229f161e55741379c59725c11c04.png)
______ .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/9d7e591c-fbf2-4dd9-9468-894edcfbc43f.png?resizew=258)
一般地,将连续的正整数1,2,…,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ceef1abeeef220b4fe5f7d96feedd90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/767f5a4746f04db68386fac3970b1ed1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dea30e7a3f7c68487d8bb224909b9455.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d6a5482f70366bced2a71ea1ed39192.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4ea3f6537473cb72da072ce46c31046.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08954cc7ad5ba3b93e5f58ece1f9d358.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bd0229f161e55741379c59725c11c04.png)
您最近一年使用:0次