名校
1 .
的三个内角
,
,
的大小成等差数列,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1f9fabbbe61a759e52ec975215e2e7c.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1f9fabbbe61a759e52ec975215e2e7c.png)
您最近一年使用:0次
2020-08-12更新
|
144次组卷
|
7卷引用:甘肃省临夏中学2018-2019学年高二上学期期中考试数学试题
甘肃省临夏中学2018-2019学年高二上学期期中考试数学试题黑龙江省哈尔滨市第六中学2016-2017学年高一下学期期中考试数学试题苏教版2016-2017学年高二必修五2.2等差数列练习数学试题陕西省西安市第一中学2017-2018学年高二上学期第一次月考数学试题(已下线)2.2等差数列(2) -2020-2021学年高二数学课时同步练(人教A版必修5)西藏林芝市第二高级中学2020-2021学年高二上学期期中考试数学试题(已下线)4.2.1 等差数列(2)-2020-2021学年高二数学课时同步练(人教A版选择性必修第二册)
名校
解题方法
2 . 已知
,且
,则
不能等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab0c6f119137e1b6760d55956d99d963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ed670b1f668778c6243f3f7470ee7d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cd3b41ec51e28436c9038a2b75a5530.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
名校
3 . 在等差数列
中,已知
,
,求
(1)数列
的通项公式;
(2)数列
的前n项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55e798065c506ed4398a9f4178a0ff65.png)
(1)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
名校
解题方法
4 . 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/3b6fc99eb8963e639156ad003ee436a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfc875ca919921e8f63a6fca648561b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2016-12-04更新
|
842次组卷
|
2卷引用:甘肃省临夏中学2018-2019学年高二上学期期中考试数学试题
名校
5 . 已知
为等差数列,
为其前
项和.若
,
,则
=__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/606e55241a2e145d54849129b8ffd20f.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/0ea8d0e50065114b05ef2dc1ea1129cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b40aecc20688c3264708a58ea95dc4f.png)
![](https://img.xkw.com/dksih/QBM/2017/9/13/1773181606322176/1774631979950080/STEM/467a5ac098d548d58483221f43c3a13a.png?resizew=23)
您最近一年使用:0次