1 . 已知数列
的前
项和为
,
,且
.
(1)求数列
的通项公式;
(2)若
,设数列
的前
项和为
,
,证明
.
![](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/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34c57356fade5a5d8e46c4750ac4bb6f.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2632ccb6fa8e2db3351cf9d919ccea6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c215db1d8f69757118ad405b78035628.png)
您最近一年使用:0次
2020-12-16更新
|
254次组卷
|
11卷引用:河北省鸡泽县第一中学2019-2020学年高一下学期开学考试数学试题
河北省鸡泽县第一中学2019-2020学年高一下学期开学考试数学试题2017届河南省豫南九校(中原名校)高三下学期质量考评八数学(文)试卷重庆市南岸区2018-2019学年高一下学期期末数学试题宁夏石嘴山市第一高级中学2019-2020学年高二上学期期末数学试题河北省沧州市第一中学2019-2020学年高一下学期第二次学段检测数学试题陕西省延安市吴起高级中学2019-2020学年高一下学期第四次质量检测(期末)数学试题陕西省西安市长安区第一中学2020-2021学年高三上学期第二次月考数学(理)试题湖北省荆州市石首市第一中学2019-2020学年高三上学期11月月考数学(文)试题湖北省荆州市石首市第一中学2019-2020学年高三上学期11月月考数学(理)试题河北省石家庄西山学校2021-2022学年高一下学期4月月考数学试题湖南省株洲市第二中学2022届高三下学期第三次月考数学试题
2 . 若
是等差数列
的前
项和,若点
在直线
上,则
的值为( )
![](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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35b47096f812978957343adb4c7bfc0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16a86b241c184854b28d80f5b667295f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b87df689b605e7a283b56d454c3736a0.png)
A.12 | B.8 | C.22 | D.44 |
您最近一年使用:0次
名校
3 . 已知无穷等差数列
,前
项和
中,
,且
,则
![](https://img.xkw.com/dksih/QBM/2016/6/23/1572817664843776/1572817670873088/STEM/50e4922a98564317b5b97a9f4c8ee3ca.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/6df775bbb96051716b1971fdfc42c210.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5ad422a03467f70121b4a3cd3c724d9.png)
A.在数列![]() ![]() | B.在数列![]() ![]() ![]() |
C.前三项之和![]() ![]() ![]() | D.当![]() ![]() |
您最近一年使用:0次
2016-12-04更新
|
651次组卷
|
3卷引用:河北省鸡泽县第一中学2019-2020学年高一下学期开学考试数学试题