1 . 已知数列
的前项和为
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d238a52feae87b0778ba324dc144d50.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c8b009fbf76ca2ee2f2ca3d730d700c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d238a52feae87b0778ba324dc144d50.png)
您最近一年使用:0次
解题方法
2 . 设
为数列
的前
项和,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5085e3cdef9ea6c564e079f745d6fdb.png)
______ .
![](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/acb8569a8c125c9678a3e75c4f1131a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92906e39027c5f92890082114b1b5648.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5085e3cdef9ea6c564e079f745d6fdb.png)
您最近一年使用:0次
2020-05-05更新
|
263次组卷
|
4卷引用:陕西省安康市2019届高三下学期第三次教学质量联考文科数学试题
3 . 已知等比数列
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/f779135ed786efbb5325824fac86256e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
A.1 | B.-1 | C.2 | D.-2 |
您最近一年使用:0次
2020-01-11更新
|
94次组卷
|
2卷引用:陕西省安康市2020届高三第一次教学质量联考理科数学试题
名校
4 . 已知数列
的前n项和为
,
,公差不为0的等差数列
满足
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cf234c0e7967b9a7fb176be1dccb685.png)
证明:数列
为等比数列.
记
,求数列
的前n项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b708c8dcb2d66eb2ce0b3718a9cd924a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d840800f0fabe918db93be34e4302740.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee4464b3b4eb6e52ee02f095aae84f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5710748951fa6b2aad7715306c9c50f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cf234c0e7967b9a7fb176be1dccb685.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/923f7131dc2d818944d5ceca6c9af39e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c23adc82feb5bb00d68da8e8e2a99afd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cca3ebd10a38201939a3694cc95186a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb26cd1601fe7e76e1e2dc0b4909324a.png)
您最近一年使用:0次
2020-01-02更新
|
751次组卷
|
4卷引用:陕西省安康市2020届高三第一次教学质量联考理科数学试题
5 . 等比数列4,6,9,…的公比为( )
A.![]() | B.![]() | C.2 | D.3 |
您最近一年使用:0次
2019-11-11更新
|
245次组卷
|
2卷引用:陕西省安康市2020届高三第一次教学质量联考文科数学试题
6 . 在数列
中,
(
).
(1)证明数列
为等比数列,并求
的通项公式;
(2)求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e541ddf4c8fe897b987a1e88cf1f0f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
(1)证明数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6accb80eb5eed305c98caee6413be64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec8713f8cfbbc8f40b2161790c7899bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
2019-11-05更新
|
1243次组卷
|
3卷引用:陕西省安康市2020届高三第一次教学质量联考文科数学试题
陕西省安康市2020届高三第一次教学质量联考文科数学试题辽宁省葫芦岛市六校协作体2019-2020学年高三上学期11月月考数学(文)试题(已下线)第20讲 数列的通项公式-2022年新高考数学二轮专题突破精练
名校
7 . 已知等差数列
的公差不为0,
中的部分项
成等比数列.若
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a41042377b781b28ed7005e58d45abc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57b57be76b6cae539d33b395ab457834.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eaa992a449b828df0ff545e233b279b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5adc71364064a9dfa0151fa6bc67d18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21d9df07573333c879ca2059c3f4e24c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a41042377b781b28ed7005e58d45abc.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2019-10-29更新
|
904次组卷
|
4卷引用:陕西省安康市2020届高三第一次教学质量联考文科数学试题
陕西省安康市2020届高三第一次教学质量联考文科数学试题宁夏固原市第一中学2021届高三下学期第一次模拟考试数学(理)试题山西省2019-2020学年高二上学期10月联合考试数学(文)试题(已下线)专题2.4+数列单元测试(重点卷)-2020-2021学年高二数学十分钟同步课堂专练(苏教版必修5)
解题方法
8 . 若
是等比数列
的前三项,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f34447968c8f7a8f07db162c088aa98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次