1 . 在单调递减等比数列
中,若
则![](https://img.xkw.com/dksih/QBM/2016/1/11/1572426830594048/1572426836361216/STEM/6a204d82167e4d988a7a035afcff5615.png)
![](https://img.xkw.com/dksih/QBM/2016/1/11/1572426830594048/1572426836361216/STEM/6dcf0e458b334fe3b140e012758f033a.png)
![](https://img.xkw.com/dksih/QBM/2016/1/11/1572426830594048/1572426836361216/STEM/e1e1ef15ad84441ebf41684f350bd97c.png)
![](https://img.xkw.com/dksih/QBM/2016/1/11/1572426830594048/1572426836361216/STEM/6a204d82167e4d988a7a035afcff5615.png)
A.2 | B.4 | C.![]() | D.![]() |
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解题方法
2 . 等差数列
中,
和
是关于方程
的两根,则该数列的前11项和
=.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc858b7a95c5006a44067022da09f667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e293efe081c79deaa68893110aa0e0a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b87df689b605e7a283b56d454c3736a0.png)
A.58 | B.88 | C.143 | D.176 |
您最近一年使用:0次
2016-12-03更新
|
538次组卷
|
4卷引用:2016届河北省邯郸市一中高三一轮收官考试一文科数学试卷
2014·河北邯郸·二模
3 . 已知等比数列前
项和为
,若
,
,则![](https://img.xkw.com/dksih/QBM/2015/11/6/1572280754692096/1572280760287232/STEM/1b9d21ad25294cb5b6b47400613acbfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://img.xkw.com/dksih/QBM/2015/11/6/1572280754692096/1572280760287232/STEM/fe6d6acea69b4e9c90e00ef6fbf09bbe.png)
![](https://img.xkw.com/dksih/QBM/2015/11/6/1572280754692096/1572280760287232/STEM/38a154b4f90f49768498d2cfdc2ae6b0.png)
![](https://img.xkw.com/dksih/QBM/2015/11/6/1572280754692096/1572280760287232/STEM/eef078fb6ff34f5380124751a4249ab1.png)
![](https://img.xkw.com/dksih/QBM/2015/11/6/1572280754692096/1572280760287232/STEM/1b9d21ad25294cb5b6b47400613acbfc.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2014·河北邯郸·一模
名校
4 . 已知
是等比数列
的前
项和,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92c36876a00f5490feb94c4fb2b6cc95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/606e55241a2e145d54849129b8ffd20f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0964c3a6191406b25622563fbdcc4b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92c36876a00f5490feb94c4fb2b6cc95.png)
A.![]() ![]() | B.![]() ![]() | C.![]() ![]() | D.![]() ![]() |
您最近一年使用:0次
2016-12-02更新
|
743次组卷
|
5卷引用:2014届河北省邯郸市高三第一次模拟考试理科数学试卷
(已下线)2014届河北省邯郸市高三第一次模拟考试理科数学试卷2015-2016学年河北武邑中学高二下4.17周考理数学卷2017届河北武邑中学高三上调考三数学(理)试卷河北省衡水市安平中学2018届高三上学期第三次月考数学(文)试题(已下线)2018年12月30日 《每日一题》(文数)人教必修5+选修1-1(高二上期末复习)-每周一测
2014·河北邯郸·二模
5 . 等差数列中,
,则该数列前13项的和是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f9e1b17a1e3a49385a9606ea9498508.png)
A.13 | B.26 | C.52 | D.156 |
您最近一年使用:0次
2010·广东揭阳·一模
6 . 数列
是公差不为0的等差数列,且
为等比数列
的连续三项,则数列
的公比为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d737c1047a14cee12a6671383e244fa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6143ff1743d17cc9c92f44dbcca18359.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a89d1f32c1605cfdb8e8855051b9f6ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a89d1f32c1605cfdb8e8855051b9f6ec.png)
A.![]() | B.4 | C.2 | D.![]() |
您最近一年使用:0次
2016-12-01更新
|
971次组卷
|
8卷引用:2011届河北省邯郸一中高三高考压轴模拟考试文数
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