题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223345-36674.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223345-39442.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223345-31857.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223345-22096.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223345-97913.png)
解析
试题分析:等差数列中由等差中项可将首位对称的项之和转化为中间项,类比等比数列中由等比中项可将首位对称的项准化为中间项,因此等比数列中等号左边是各项乘积的形式,右边是幂的形式
点评:等差数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223346-28790.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223346-56477.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223346-99592.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223346-36642.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223346-56477.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223347-50989.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223318-54540.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223318-56474.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223318-80295.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223319-36533.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223319-40994.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223319-49092.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223319-23379.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223319-48941.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223320-18851.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223320-53868.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223320-28766.png)
(2)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223320-93891.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223235-96968.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223235-12373.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223235-40081.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223235-70662.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223236-83529.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223236-20375.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223236-69778.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223236-30825.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223237-24669.png)
(2)求通项
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223236-69778.png)
(3)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223237-84593.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223215-16314.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223216-64384.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223216-89710.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223216-39054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223216-49791.png)
A.48 | B.49 | C.50 | D.51 |
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223101-83139.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223101-83139.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223101-52858.png)
A.-110 | B.-90 | C.90 | D.110 |
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223052-76087.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223052-74907.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009223052-13858.png)
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