名校
1 . 等差数列
中,
是数列
的前
项和,则数列
的前
项和最大时,
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/096f7e97d90384ba51d3474d6e1804e9.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/4dea1dd4ffcb4cf0697ca43079f6a1f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
A.20 | B.![]() | C.20或21 | D.21或22 |
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2021-05-09更新
|
821次组卷
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5卷引用:新疆乌鲁木齐地区2021届高三三模数学(理)试题
新疆乌鲁木齐地区2021届高三三模数学(理)试题江西省临川第一中学暨临川一中实验学校2021届高三模拟考试数学(文)试题河南省新乡名校2020-2021学年下学期期末联考高二数学(文)试题(已下线)6.1 等差数列(精练)-【一隅三反】2022年高考数学一轮复习(新高考地区专用)北京市第一七一中学2023-2024学年高二上学期12月月考数学试题
2 . 已知等差数列
中,
,
,求前
项和
的最小值为____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1549723d901eeb2cf966e322f404a5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e5b4a732d19d9af000806132556686c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
2020-08-03更新
|
135次组卷
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7卷引用:新疆乌鲁木齐市第四中学2020-2021学年高一年级下学期期中考试数学试题
新疆乌鲁木齐市第四中学2020-2021学年高一年级下学期期中考试数学试题2020届江苏省宿迁市高三下学期5月联考数学试题河北省石家庄市元氏县第四中学2019-2020学年高一下学期摸底数学试题(已下线)专题14 等差数列-2020年高考数学(文)母题题源解密(全国Ⅱ专版)上海市奉贤区2023届高三上学期期中数学试题(已下线)专题04 等差数列-2020年高考数学(理)母题题源解密(全国Ⅱ专版)(已下线)高二下期中真题精选(常考60题专练)-【满分全攻略】2022-2023学年高二数学下学期核心考点+重难点讲练与测试(沪教版2020选修一+选修二)
名校
3 . 已知等差数列
的前n项和为
,
,
.
(1)求数列
的通项公式;
(2)求
的最大值.
![](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/c0b81d3df0116a45704ea1ccb6a3a9d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c5ac56914919b48c2cbbe6c9387b87c.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
2019-05-23更新
|
1313次组卷
|
4卷引用:【全国百强校】新疆乌鲁木齐八一中学2018-2019学年高一下学期期中考试数学试题
名校
4 . 若点
都在函数
图象上,则数列
的前
项和最小时的
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4976cb432a52c2316bc7dad303474c0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64f2465f78793fb0b94ccc2687b94e6c.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/b6a24198bd04c29321ae5dc5a28fe421.png)
A.7或8 | B.7 | C.8 | D.8或9 |
您最近一年使用:0次
2019-04-25更新
|
947次组卷
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5卷引用:【全国百强校】新疆生产建设兵团第二中学2018-2019学年高一下学期期中考试数学试题
名校
5 . 设
是等差数列
的前n项和,若
,
,则
取最大值时n的值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81c68c6e1ecc9657768b37ce4ac1767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d2348d5068480809ea002ebc2d3261b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e312ac14fb6891f077cadae7c0506536.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c12a2f548c168d2f62bea2c655ace673.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81c68c6e1ecc9657768b37ce4ac1767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
A.9 | B.8 | C.7 | D.6 |
您最近一年使用:0次
2019-03-27更新
|
712次组卷
|
2卷引用:新疆伊宁市第三中学2019-2020学年高一下学期期中考试数学试题
名校
6 . 已知等差数列
中,
,则
的前
项和
的最大值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cf51d2da9fb5a233723a51e6f274c7b.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)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2017-04-14更新
|
1750次组卷
|
5卷引用:新疆兵团第十二师高级中学2022届高三上学期第二次月考数学(理)试题
11-12高一下·福建漳州·期中
名校
7 . 已知等差数列
中![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14d03cc7c9f4351d23ba3ab841b16069.png)
(1)求数列
的通项公式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)当n取何值时,数列
的前
项和
取得最值 ,并求出最值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14d03cc7c9f4351d23ba3ab841b16069.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)当n取何值时,数列
![](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/b708c8dcb2d66eb2ce0b3718a9cd924a.png)
您最近一年使用:0次
2016-12-01更新
|
1586次组卷
|
8卷引用:新疆新和县实验中学2021届高三上学期期中考试数学试题