名校
解题方法
1 . 等差数列
的公差为2,若
,
,
成等比数列,记
=
,数列
的前n项和
,则
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7da2f386b78cdf6489efaa2f5820d3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6386e9b8a42cbee98bffea5f737ed8ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f30f56664446f32dbbc2c5f12a99374.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2020-10-12更新
|
223次组卷
|
2卷引用:内蒙古自治区阿拉善盟阿拉善盟第一中学2020-2021学年高二上学期第一次段考理科数学试题
名校
2 . 公比为
的等比数列
的各项都是正数,且
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55df059a3e31d7decf2e2a657541d43b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8902f22f7f863a60af2a51f446a18308.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1779b63df1485d68108ba8bf7b2a5d83.png)
A.2 | B.3 | C.4 | D.5 |
您最近一年使用:0次
2020-01-03更新
|
309次组卷
|
2卷引用:内蒙古阿拉善盟第一中学2020-2021学年高二上学期第二次段考理科数学试题