2014·河北邯郸·二模
1 . 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 |
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2011·河北邯郸·二模
解题方法
2 . 设{an}是公比大于1的等比数列,Sn为数列{an}的前n项和,已知S3=7,且a1,a2,a3﹣1成等差数列.
(1)求数列{an}的通项公式;
(2)若bn=log4a2n+1,n=1,2,3…,求和:
.
(1)求数列{an}的通项公式;
(2)若bn=log4a2n+1,n=1,2,3…,求和:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0baffb0fb778c97005165c7a422766c.png)
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解题方法
3 . 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 |
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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
4 . 在各项均为正数的等比数列
中,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7898a3e9e681b8eed164570229bf943.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21d46b472446f2cfd3da04674a186697.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7898a3e9e681b8eed164570229bf943.png)
A.有最小值6 | B.有最大值6 | C.有最大值9 | D.有最小值3 |
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2016-12-04更新
|
563次组卷
|
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5 . 在△ABC中,a,b,c为∠A,∠B,∠C的对边,且
,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764dd19b258da417dc1b0c5de7fe1cb7.png)
A.a,b,c成等差数列 |
B.a,c.b成等差数列 |
C.a,c.b成等比数列 |
D.a,b,c成等比数列 |
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2014·河北邯郸·一模
6 . 已知等比数列
是递增数列,
是
的前
项和.若
是方程
的两个根,则![](https://img.xkw.com/dksih/QBM/2014/4/25/1571665007329280/1571665013039104/STEM/6b80442b67ef46d8929219189792165d.png?resizew=35)
___________ .
![](https://img.xkw.com/dksih/QBM/2014/4/25/1571665007329280/1571665013039104/STEM/c6f9c05a94764aef91b086563f57210c.png?resizew=31)
![](https://img.xkw.com/dksih/QBM/2014/4/25/1571665007329280/1571665013039104/STEM/f142a150d9924fa1a1a861fe214b1d75.png?resizew=20)
![](https://img.xkw.com/dksih/QBM/2014/4/25/1571665007329280/1571665013039104/STEM/c6f9c05a94764aef91b086563f57210c.png?resizew=31)
![](https://img.xkw.com/dksih/QBM/2014/4/25/1571665007329280/1571665013039104/STEM/3a18e6995e484656957c13aad2606307.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2014/4/25/1571665007329280/1571665013039104/STEM/1e8b8875567540db948c88ca74b4fa10.png?resizew=37)
![](https://img.xkw.com/dksih/QBM/2014/4/25/1571665007329280/1571665013039104/STEM/ac2c20aec54e46cabfe76aa6fb254152.png?resizew=107)
![](https://img.xkw.com/dksih/QBM/2014/4/25/1571665007329280/1571665013039104/STEM/6b80442b67ef46d8929219189792165d.png?resizew=35)
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2010·广东揭阳·一模
7 . 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.![]() |
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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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2014·河北邯郸·一模
名校
8 . 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.![]() ![]() |
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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
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9 . 已知数列
满足
,
(
),则
的最小值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8838da7dd0d8b3055905a97e11db003.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39a69c59b22bbb875d664b23ae641e68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c40ba6916865c22cdde2221d9bef9da6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77288bfa684c2a9ca00c75743232a0e3.png)
您最近一年使用:0次
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|
503次组卷
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2卷引用:2016届河北省邯郸市一中高三一轮收官考试一理科数学试卷
10 . 已知公比小于1的等比数列
的前
项和为
,
且
.
(1)求数列
的通项公式;
(2)设
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d737c1047a14cee12a6671383e244fa5.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/352d9b76dcf639368fa68cae70149802.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29c072f268ae4eda5ea64f36659a318e.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd0f044dc82a12fd1c71872f2ac12d06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a89d1f32c1605cfdb8e8855051b9f6ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次