1 . 已知
,
都是等差数列,且
,
,
,则数列
的前10项和
为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/385275d29d8c8a7841eaeaa3dfab2cdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27de8c7441981d7f8c3e346e8e7e32b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5344eadd4711db34e3f935aedd5fb270.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f3cf6f2bbe20a404fea41a4d2b1c4c7.png)
A.60 | B.65 | C.70 | D.75 |
您最近一年使用:0次
2023-08-26更新
|
720次组卷
|
2卷引用:贵州省天柱民族中学2024届高三上学期第一次月考数学试题
名校
2 . 已知数列
中,
,且
为数列
的前
项和,记
,则数列
的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/938a0135e617573bdfcac8305faec193.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0e82e4465fe2e508285727df11c5785.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/b922dc7676409ef5e241fec167e42123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
A.最小项为![]() | B.最大项为![]() |
C.最小项为![]() | D.最大项为![]() |
您最近一年使用:0次
解题方法
3 . 已知等差数列
的前
项和为
,若
,则
的取值范围是( )
![](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/3f95401dc827eea7d5a950f06ed11327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d27182444d3da4003680f07ec299087c.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2023-06-17更新
|
121次组卷
|
2卷引用:贵州省镇远县文德民族中学校2023届高三下学期5月月考(全国甲卷押题卷三)数学(理)试题
4 . 如图的形状出现在南宋数学家杨辉所著的《详解九章算法·商功》中,后人称为“三角垛”.“三角垛”的最上层有1个球,第二层有3个球,第三层有6个球……设各层球数构成一个数列
,则
( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/dc4ce844-382a-4495-a814-7106b5a06aa1.png?resizew=131)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d80f5e7ab075efb439feef0f651edaf6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/dc4ce844-382a-4495-a814-7106b5a06aa1.png?resizew=131)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2023-04-25更新
|
412次组卷
|
2卷引用:贵州省凯里市第一中学2023届高三三模数学(理)试题
5 . 在等差数列
中,已知
,则该数列前2019项的和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9b30c3d7cc1e41af67e909df3f39830.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44d9b05b539e69668dc24c3b9844bd87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9b30c3d7cc1e41af67e909df3f39830.png)
A.2018 | B.2019 | C.4036 | D.4038 |
您最近一年使用:0次
9-10高三·贵州·阶段练习
6 . 在等差数列
中,
,则此数列的前13项的和等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efdd795838311fec7cf7572d8e1be92b.png)
A.16 | B.26 | C.8 | D.13 |
您最近一年使用:0次
2016-12-03更新
|
590次组卷
|
9卷引用:2013届贵州省凯里一中高三第一次考试理科数学试卷
(已下线)2013届贵州省凯里一中高三第一次考试理科数学试卷(已下线)2011届贵州省四校联考高三第四次月考数学卷(已下线)2012届安徽省蚌埠二中高三12月月考理科数学(已下线)2012届山东省济宁市梁山二中高三12月月考理科数学2017届福建连城县二中高三文上学期期中数学试卷湖北省长望浏宁四县2018年高三3月联合调研考试数学文试题2020届安徽省庐巢七校联盟高三第五次联考数学(理)试题北京市密云区2017~2018学年高三年级9月阶段测试数学(文)试题北京市育英学校2021-2022学年高二4月期中考试数学试题
7 . 设等差数列
的前
项和为
,若
,
,则
等于
![](https://img.xkw.com/dksih/QBM/2015/3/4/1571990034972672/1571990040494080/STEM/a5e8cf9ada344990af09d335029c5beb.png)
![](https://img.xkw.com/dksih/QBM/2015/3/4/1571990034972672/1571990040494080/STEM/a8f9d28b771d40549c51482e0eb5481b.png)
![](https://img.xkw.com/dksih/QBM/2015/3/4/1571990034972672/1571990040494080/STEM/5a16bde486f947239e1e200ba60b49c1.png)
![](https://img.xkw.com/dksih/QBM/2015/3/4/1571990034972672/1571990040494080/STEM/7a061f45c61b4163baf9257ef4b60ebb.png)
![](https://img.xkw.com/dksih/QBM/2015/3/4/1571990034972672/1571990040494080/STEM/6105393ffce84b379122f60dd0eea15c.png)
![](https://img.xkw.com/dksih/QBM/2015/3/4/1571990034972672/1571990040494080/STEM/217f4e69ef264e2597032cbbf06b27fc.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次