题目
题型:不详难度:来源:
(1)求数列{an}的通项公式;
(2)设bn=log2an,求数列{bn}的前n项和Sn.
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095228-12690.png)
解析
核心考点
试题【(本小题满分12分)已知等比数列{an}中,an > 0,公比q∈(0,1),且a1a5+2a3a5+a2a8=25, a3与a5的等比中项为2.(1)求】;主要考察你对等比数列等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095222-62201.png)
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![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095222-31222.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095223-71161.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095223-51317.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095223-35617.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095223-15124.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095216-39078.png)
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![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095216-39078.png)
A.1 | B.1或![]() | C.![]() | D.-1或![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095206-55701.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095206-78154.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095206-94676.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095206-55639.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095206-82971.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095206-58976.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095206-74893.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095206-88397.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095151-27132.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095151-12341.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095151-28098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095152-87049.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095152-29599.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095152-67139.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095152-14516.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095153-69345.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095153-23513.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095153-32315.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095153-31617.png)
(1)证明数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095154-69211.png)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095153-69345.png)
(3)设
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095154-83066.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095154-37179.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095154-96712.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095143-49943.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095144-41493.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095144-48275.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095144-50714.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095144-41493.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095144-73495.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095145-28915.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014095145-76178.png)
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