等差数列
的前
项和为
,则其通项公式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca6489196eefa408fddcbe1389e812d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
更新时间:2017-11-12 10:03:55
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解题方法
【推荐1】在等差数列
中,
,如果
是
与
的等比中项,那么k=___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/781bafb821f3926666006bee31bbb3de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f255d0395fba51ca2d44293cca42e0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7da2f386b78cdf6489efaa2f5820d3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a4e35eeb453d46309a8c1de15acdad.png)
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【推荐2】设
是等差数列
的前
项和,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b662cd187b56ec159920a187e3e86ba5.png)
_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5905c7871e895b2e6164191e106d3a8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b662cd187b56ec159920a187e3e86ba5.png)
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【推荐1】某地区为防汛抗旱大面积植树造林,如图,在区域
内植树,第1棵树在点
,第2棵树在点
,第3棵树在点
,第4棵树在点
,接着按图中箭头方向,每隔一个单位长度种一棵树,那么第2020棵树所在的点的坐标是______ .
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【推荐2】记等差数列
的前
项和为
,若
,则该数列的公差
___________
![](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/3a3d07cbe8d13fdab383105fe523869b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
您最近一年使用:0次