已知在等差数列
中,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e130aca2b2b3820769fa31225888062.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28fb3634ef6515ebb1db5df9208a9f69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6832051de5898c8540b448f73eb3795c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e130aca2b2b3820769fa31225888062.png)
更新时间:2023-11-23 13:55:12
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相似题推荐
填空题-单空题
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解题方法
【推荐1】已知数列
满足
则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62ffbfb2502cc0ef8c5e1e60c567df35.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d4840c6687295617a697a3c5bbdb053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62ffbfb2502cc0ef8c5e1e60c567df35.png)
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解题方法
【推荐2】在等差数列
中,已知
,
与
的等差中项为
,等比中项为
,则通项公式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
________ ;前
项和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/065be21c20118f713d288f3a84ad114f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65fc200f10b97588a0c9896277c9c64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.png)
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【推荐1】设
是等差数列
的前
项和,若
,
,则
等于_____________ .
![](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/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/983f4e19b55e3290f04fce082d4b917c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da4cd81500bdb43118150dbdb1541e6.png)
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【推荐2】毕达哥拉斯学派是古希腊哲学家毕达哥拉斯组建的学派,他们长把沙滩上的沙粒或者小石子用数表示,并由它们排列而成的形状对自然数进行研究,如图,图形中的圆点数分别是1、5、12、22…,以此类推,第五个图形对应的圆点数为___________ .
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