已知等差数列
的前
项和为
.若
,
,则
( )
![](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/b21df5bd9447b0f9be9ab2494ab44e71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e260eae5be69a79f97d7337f944a186.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d36243198e5e20c56399e4ad5ac3c519.png)
A.72 | B.74 | C.75 | D.76 |
2022·全国·模拟预测 查看更多[4]
2022年普通高等学校招生全国统一考试临考押题密卷(B)理科数学试题北京市中国人民大学附属中学2021-2022学年高二下学期数学统练试题(四)(已下线)专题24 等差数列及其前n项和-1(已下线)第3讲 等差数列的前 项和及性质10大题型(1)
更新时间:2022-06-06 13:18:53
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【推荐1】若公差为负的等差数列
中的两项
是方程
的两个根,设数列
的前
项和为
,则当
最大时,
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.5 | B.9或10 | C.10 | D.9 |
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【推荐2】《九章算术》卷第六《均输》中,提到如下问题:“今有竹九节,下三节容量四升,上四节容量三升.问中间二节欲均容,各多少?”其大致意思是说,若九节竹每节的容量依次成等差数列,下三节容量四升,上四节容量三升,则中间两节的容量各是( )
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
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【推荐1】已知等差数列
的前n项和为
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2167cef596a26c509fd38cd461ac51b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30eb42578f654fb61e826026d2199751.png)
A.140 | B.70 | C.154 | D.77 |
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【推荐2】等差数列
的前
项和为
,则
( )
![](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/7f4e75e90899ba1131fbefdbb4589fa1.png)
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A.10 | B.20 | C.30 | D.40 |
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【推荐1】等差数列
中,
,
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=( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d786bde127368fd1b2ed7a7d233db866.png)
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A.45 | B.54 | C.52 | D.108 |
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【推荐2】已知等差数列
的前
项和为
且
,则
的前
项和为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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A.![]() | B.![]() |
C.![]() | D.![]() |
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