18-19高二·全国·假期作业
名校
1 . 设数列
满足
,且
,记
的前
项和为
,则
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e976c0663fa749ca749f99842d21ca03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb06c328e28d4872aeb5a95184420a3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a4c79fe4440c90d8dbd92e8f1c4ff22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e976c0663fa749ca749f99842d21ca03.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/2a27c112387e56c976489fa484c0d48f.png)
A.1025 | B.1024 |
C.10250 | D.20240 |
您最近一年使用:0次
2019-12-17更新
|
210次组卷
|
3卷引用:步步高高二数学寒假作业:作业5等比数列
名校
2 . 已知数列
的前
项和为
,且数列
是首项为3,公差为2的等差数列,若
,数列
的前
项和为
,则使得
成立的
的最小值为__________ .
![](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/4dea1dd4ffcb4cf0697ca43079f6a1f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e14eedc2934191808096c1808ca29f21.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/0dbabc4c8b8b6e2e53a9e13b8db92172.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
2018-08-29更新
|
2525次组卷
|
5卷引用:江西省南昌市2017-2018学年度高三第二轮复习测试卷文科数学(三)
名校
3 . 一个正项等比数列前
项的和为3,前
项的和为21,则前
项的和为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43f41be870e84c819362787849770519.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d51f9147b8265c0276c1f2c2659197.png)
A.18 | B.12 | C.9 | D.6 |
您最近一年使用:0次
2017-08-13更新
|
164次组卷
|
4卷引用:四川省内江市2016-2017学年高一下学期期末检测数学(文)试题