设等差数列
的前
项和为
,且
,
,则当
最大时,
( )
![](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/8e50941c44c2701f041500a3bf4bab1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b134439819d3069da709979cb9b1a991.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
A.1010 | B.1011 | C.1012 | D.1013 |
21-22高二下·江西赣州·阶段练习 查看更多[3]
江西省赣州市教育发展联盟2021-2022学年高二下学期第8次联考数学(文)试题(已下线)第3讲 等差数列的前 项和及性质10大题型(4)(已下线)专题5 等差数列的单调性和前n项和的最值问题 微点2 等差数列前n项和的最值的求法
更新时间:2022-06-06 15:37:08
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【推荐1】已知等差数列
的前n项和为
有最小值,且
,则使
成立的正整数n的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf0d5d31a0dc2d9d57d7f9876058522.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49763402b2f2023f0ba64c37924267d3.png)
A.9 | B.10 | C.17 | D.18 |
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【推荐2】我国南北朝时的数学著作《张邱建算经》有一道题为:“今有十等人,每等一人,宫赐金以等次差降之,上三人先入,得金四斤,持出,下三人后入得金三斤,持出,中间四人未到者,亦依次更给,问各得金几何?”则在该问题中,中等级中的五等人与六等人所得黄金数( )
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
【推荐1】已知数列
为等差数列,其前
项和为
,且
,给出以下结论:
①
;②
;③
;④
.
其中一定正确的结论是
![](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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbf2c923e39823250b0fcfd52fc809fc.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83dda756cca393b4480163274559fbdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f1e21ae49e237470c9ad23ffd0dbab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dcd8de1d7642bc8a450730090b369a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3ed461a52cd069fab1f42aa77a48677.png)
其中一定正确的结论是
A.①② | B.①③④ | C.①③ | D.①②④ |
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【推荐2】等差数列
的前n项和为
,若
,
,则数列
中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b708c8dcb2d66eb2ce0b3718a9cd924a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e1c58c811c2939c8f86f99e0b8e6eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e571a78004112d9553052fa91b7a4324.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65516fff13cb1be8221727135921c346.png)
A.首项最大 | B.第9项最大 |
C.第10项最大 | D.第11项最大 |
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