已知数列
为等差数列,其前
项和为
,且
,给出以下结论:①
;②
最小;③
;④
,正确的有_______ .
![](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/dbf2c923e39823250b0fcfd52fc809fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83dda756cca393b4480163274559fbdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f3cf6f2bbe20a404fea41a4d2b1c4c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dcd8de1d7642bc8a450730090b369a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3ed461a52cd069fab1f42aa77a48677.png)
18-19高三上·浙江宁波·期中 查看更多[3]
【全国百强校】浙江省宁波市镇海中学2019届高三上学期期中考试数学试题(已下线)第02讲 等差数列及其前n项和(练)-《2020年高考一轮复习讲练测》(浙江版)(已下线)专题7.2 等差数列及其前n项和(练)-2021年新高考数学一轮复习讲练测
更新时间:2019-09-06 14:22:29
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【推荐2】已知函数
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【推荐1】已知数列
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_________________ .
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【推荐2】设四个数中,前三个成等比数列,其和为
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【推荐1】如图三角形数阵:
1
2 3
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______ .
1
2 3
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【推荐1】已知
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,给出下列五个命题:
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;②
;③
;④数列
中的最大项为
;⑤
.
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①
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