题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054718-31857.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054718-46462.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054718-80428.png)
答案
解析
试题分析:根据题意,由于
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054718-46462.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054718-18824.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054718-80428.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054719-80198.png)
点评:解决的关键是利用等差中项的性质来得到第八项,然后借助于中项性质求解,属于基础题。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054700-91777.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054701-60105.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054701-71496.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054654-63774.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054654-75969.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054655-72407.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054649-84753.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054649-60404.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054649-14743.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054626-14445.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054627-44180.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054627-54636.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054627-51194.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054627-42150.png)
(Ⅱ)数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054628-94246.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054628-38774.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054628-72670.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054628-76806.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054628-94246.png)
(Ⅲ)令
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054628-98204.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054629-48116.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054635-35766.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054620-34379.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054620-54043.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054621-26472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012054621-71891.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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