在等差数列{an}中,a1=1,a2+a6=10,则a7=________ .
更新时间:2020-11-19 17:50:01
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【知识点】 等差数列通项公式的基本量计算
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填空题-单空题
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较易
(0.85)
解题方法
【推荐1】设
是等差数列,且
,
,则数列
的前
项和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13a6e1d671215fc96e4bee3541d1096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e7f395f753da570e66cfcf3f5df752.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/04c2864e2ec3416cc4c081ac1f71a0af.png)
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填空题-单空题
|
较易
(0.85)
名校
解题方法
【推荐2】已知等差数列
的前n项和为
,若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad9109c39ec27f72b24d2a3db77ecf45.png)
,则
的最小值为________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad9109c39ec27f72b24d2a3db77ecf45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39d227579330dfb6883861d3d0489107.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d945c0db0492a3b656df1daea63ca6c4.png)
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