解题方法
1 . 已知正项等比数列
的前
项和为
,且
,
与
的等差中项为5,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/01332bd789b34743305c97eae15e95f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da4cd81500bdb43118150dbdb1541e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/614306cc3f34bdee4d5d885b79667645.png)
A.5 | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
2 . 正项等比数列
的公比为2,若
,则
的值是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f8ac4cfec2a6d2e037762df06d42943.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc858b7a95c5006a44067022da09f667.png)
A.8 | B.16 | C.32 | D.64 |
您最近一年使用:0次
2016-12-03更新
|
1243次组卷
|
6卷引用:2015届山东省德州一中高三上学期1月月考理科数学试卷
3 . 已知数列
为等比数列,
,且
是
与
的等差中项,则
的值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663bbc5767b9cb453cb08e1f0a8e0602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b42791b77924729f7e31712177b26af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cbeed5324c432101be517dd6f5c735b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feaf542829b99205948fa97442c3db92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a71e7aa308d56d8f0363cce65928785.png)
A.![]() ![]() | B.![]() ![]() | C.![]() | D.![]() |
您最近一年使用:0次
解题方法
4 . 已知数列
满足
,则
的通项公式为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d562e8a817d5a6315a60d30bf1deb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2017-11-23更新
|
655次组卷
|
2卷引用:山东省临沂市兰山区2017—2018学年高二上学期数学(理)期中考试试题
5 . 已知数列
的前n项和为
,若
,则
( )
![](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/a75a0f9518dcd6d0dae3fbbc72c8facb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
6 . 在明朝程大位《算术统宗》中有这样的一首歌谣:“远看巍巍塔七层,红光点点倍加增,共灯三百八十一,请问尖头几盏灯”.这首古诗描述的这个宝塔古称浮屠,本题说“宝塔一共有七层,每层悬挂的红灯数是上一层的
倍,共有
盏灯,问塔顶有几盏灯?”根据上述条件,从下往上数第四层有盏灯.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76e96fef48b738bb42f5b39c4bc971e5.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2018-03-06更新
|
459次组卷
|
3卷引用:山东省垦利第一中学等四校2017-2018学年高二上学期期末考试数学(理)试题
山东省垦利第一中学等四校2017-2018学年高二上学期期末考试数学(理)试题山东省垦利第一中学等四校2017-2018学年高二上学期期末考试数学(文)试题(已下线)《2018艺体生文化课-百日突围系列》基础篇 专题9 必得分之--等差数列与等比数列的基本运算
名校
7 . 已知数列
的前n项和为
,若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/868b591bbf34859bf491022407a44f30.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/868b591bbf34859bf491022407a44f30.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2018-04-25更新
|
455次组卷
|
5卷引用:山东省济宁市2017-2018学年高二上学期期末考试数学(文)试题
解题方法
8 . 已知
是首项为32的等比数列,
是其前
项和,且
,则数列
前10项和为( )
![](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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b4439516ce100f355fc203c2503110e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79a01631b941a560c5dbe143d5fdd45.png)
A.58 | B.56 | C.50 | D.45 |
您最近一年使用:0次
2016-12-03更新
|
1797次组卷
|
2卷引用:2014-2015学年山东省文登市高二上学期期末考试理科数学试卷
9 . 公比为
的等比数列
的各项都是正数,且
,则
等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f26610e8d44f6a4ad1fce0caeb84037.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65fc200f10b97588a0c9896277c9c64.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
10 . 数列
,
,若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dbd9ff686703cad03aa383e5fec21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d737c1047a14cee12a6671383e244fa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff2c9067f55350ac14f34b3e35ae57d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13a6e1d671215fc96e4bee3541d1096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55216c0afe659a36308b374715c84576.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dbd9ff686703cad03aa383e5fec21.png)
A.![]() | B.![]() |
C.48 | D.94 |
您最近一年使用:0次
2016-12-05更新
|
295次组卷
|
4卷引用:2016-2017学年山东寿光现代中学高二10月月考数学试卷