题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111721-78947.gif)
(I)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111721-79137.gif)
(II)若
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111721-44404.gif)
答案
解:(I)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111721-60843.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111722-66348.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111722-34680.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111722-44510.gif)
(II)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111722-41373.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111722-71961.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111723-20897.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111723-91853.gif)
由①—②得
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111723-73827.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111723-12812.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111724-28613.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111724-88733.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111724-17747.gif)
解析
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111702-77868.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111702-17486.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111702-92114.gif)
则m=" " ▲
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111555-51520.gif)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111555-63122.gif)
(2)令
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111601-41427.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111601-80555.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111601-93010.gif)
已知等差数列{an}中,首项a1=1,公差d为整数,且满足a1+3<a3,a2+5>a4,数列{bn}满足
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111512-76062.gif)
(Ⅰ)求数列{an}的通项公式an;
(Ⅱ)若S2为S1,Sm(m∈N*)的等比中项,求正整数m的值.
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111500-44135.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111500-15123.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111500-10191.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111500-24852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111501-48252.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111500-10191.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111500-15123.png)
A.8 | B.7 | C. 6 | D.9 |
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111441-48471.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111441-83395.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111442-56208.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111442-46458.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111442-23675.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111442-11063.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111442-10223.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111443-68742.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111443-12444.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111443-63480.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011111443-72669.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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