题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231937-87232.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231938-58103.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231938-27480.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231938-25445.png)
答案
解析
解:因为数列{an}是等差数列,且a5=4,a7=6,设其公差为d,
所以a7=a5+2d,即6=4+2d,所以d=1,则a9=a5+4d=4+4×(1)=8.
故答案为8.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231848-23164.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231848-13835.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231849-29798.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231849-33611.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231849-39496.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231849-16556.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231850-99941.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231850-13600.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231850-68731.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231759-88495.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231759-70284.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231759-75008.png)
A.18 | B.36 | C.54 | D.72 |
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231646-14180.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231646-94528.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231646-35760.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231646-94687.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231647-80983.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231646-14180.png)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231652-87690.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231652-36115.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231652-88449.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231653-60303.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231621-63148.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231621-17709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231622-31146.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231621-63148.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231622-32432.png)
(Ⅱ)记
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231622-48960.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231622-37745.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231621-17709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231623-51070.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231507-44658.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231507-62219.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231507-97732.png)
(I)求证:数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231508-28243.png)
(II)令
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231508-99704.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231508-82820.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231508-91283.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010231509-37836.png)
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