题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012150221-98596.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012150221-18526.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012150221-14863.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012150222-55760.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/20191012/20191012150208-77364.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012150208-19237.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012150208-17281.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012150208-74459.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012150209-41218.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012150209-97961.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012150209-47120.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012150209-49699.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012150210-96503.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012150139-90845.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012150139-90845.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012150139-90845.png)
(2)令
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012150139-43801.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012150140-29896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012150111-70132.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012150111-38189.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012150111-76910.png)
A.18 | B.36 | C.54 | D.72 |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012145831-76031.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012145831-96703.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012145831-36060.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012145831-76031.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012145831-94961.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012145832-41444.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012145832-90009.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012145832-10011.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012145723-13858.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012145723-78350.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012145723-22567.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012145724-94408.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012145724-28939.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012145724-46976.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012145724-34482.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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