名校
1 . 等差数列
的前
项和为
,
,
,则
取最小值时,
的值为( )
![](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/00c45054e13d8466c093dc349bf9c8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcc3f2d8ef9d7aae5ddf1bf880ace8d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.2 | B.3 | C.4 | D.5 |
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2020-08-21更新
|
313次组卷
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5卷引用:黑龙江省哈尔滨市第三中学校2020届高三第二次模拟考试数学(文)试题
黑龙江省哈尔滨市第三中学校2020届高三第二次模拟考试数学(文)试题黑龙江省哈尔滨市第三中学校2020届高三第二次模拟考试数学(理)试题(已下线)第24讲 等差数列及其前n项和-2021年新高考数学一轮专题复习(新高考专版)宁夏贺兰县景博中学2021届高三上学期统练(四)数学(理)试题青海省西宁市普通高中五校2020-2021学年高三上学期期末联考数学(文)试题
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2 . 已知等差数列{an}中,Sn是它的前n项和,若S16>0,且S17<0,则当Sn取最大值时的n值为( )
A.7 | B.8 | C.9 | D.16 |
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2019-12-23更新
|
423次组卷
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4卷引用:黑龙江省七台河市勃利县2019-2020学年高一(下)期末数学试题
名校
3 . 已知等差数列
的前n项和为
,
,
,当
取最大值时n的值为
![](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/ad2da0ff9dc73d62f8162fc3de186150.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4be9a388b7f772af8dc8407c7951536.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
A.3 | B.4 | C.5 | D.6 |
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2019-12-04更新
|
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2卷引用:黑龙江省大庆市大庆实验中学2019-2020学年高三上学期期中数学(文)试题
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4 . 等差数列
中,
,若其前
项和
有最大值,则使
成立的最大自然数
的值为
![](https://img.xkw.com/dksih/QBM/2018/1/2/1851584022036480/1853408873185280/STEM/9b4be76588f44ac1b5083282b9870aa7.png?resizew=31)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfc09e305f5528f623a126506e770b2.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/49763402b2f2023f0ba64c37924267d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.19 | B.20 | C.9 | D.10 |
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2018-01-04更新
|
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3卷引用:黑龙江省鹤岗市第一中学2019-2020学年高一下学期期末考试数学(文)试题
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解题方法
5 . 设等差数列
的前
项和为
,若
,
,则当
取最小值时,
等于( )
![](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/9ff6bd0b129ecb5c0ecfb3190a269ad0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c59b1a247775febe0106ba3898b9111e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.7 | B.6 | C.5 | D.4 |
您最近一年使用:0次
名校
6 . 已知等差数列
中,
是它的前
项和,若
,且
,则当
取最大值时的
值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3a2be522aee0a5b497eee5c1ac28740.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6176b35f2b161e8676650a1d4e2baedf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.8 | B.9 | C.16 | D.17 |
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7 . 等差数列{an}中,已知a5>0,a4+a7<0,则{an}的前n项和Sn的最大值为( )
A.S7 | B.S6 | C.S5 | D.S4 |
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2018-06-22更新
|
371次组卷
|
2卷引用:【全国百强校】黑龙江省双鸭山市第一中学2017-2018学年高一下学期第二次(6月)月考数学(理)试题
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8 . 在等差数列
中,
,
且
,
为数列
的前n项和,则使
的
的最大值为.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f354d29ae9041c5b1f575b95dd59d79c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6b65094560149ed9b478501e012b277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d24afae78ccef0126afd56742d18375.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49763402b2f2023f0ba64c37924267d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.31 | B.32 | C.33 | D.34 |
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2018-04-29更新
|
588次组卷
|
3卷引用:黑龙江省青冈县一中2017-2018学年高一下学期期中考试A卷数学(文)试题
名校
解题方法
9 . 若等差数列
的前n项和为
,
,则
取最小值时n的值为( )
![](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/026db804023caaa8728a0f658bca9630.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
A.2017 | B.2018 | C.2019 | D.2020 |
您最近一年使用:0次
名校
10 . 已知
为等差数列
的前
项和,
,
,则
取最小值时,
的值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](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/d745e02405d358cf1a05de35fcd5de30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96fe7e6c0d5633bfc7adc17471d1eccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.12 | B.13 | C.24 | D.26 |
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