设公差不为
的等差数列
的前
项和为
,若
、
、
成等比数列,且
,则
的值是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.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)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65fc200f10b97588a0c9896277c9c64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e84c30444f13d37ada78285dc4f83b7.png)
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2020高三·全国·专题练习 查看更多[1]
(已下线)专题6.5 数列的综合应用(精讲)-2021届高考数学(文)一轮复习讲练测
更新时间:2020-10-27 15:11:51
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【推荐1】已知数列
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【推荐2】设等差数列{an}的前n项和为Sn,Sm-1=
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【推荐1】设等差数列
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____ .
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【推荐1】下列命题中,真命题的序号是__________ .
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①
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c296227429f7018957dd200b8ebc7e28.png)
②数列
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42dc22436b2a4edf3d6e15e1e5a15343.png)
⑤常数数列既是等差数列又是等比数列;
⑥数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59557c76432f5350a610400e7ab8d27c.png)
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【推荐2】已知数列
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