题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114917-17664.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114918-81496.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114918-11387.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114918-30801.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114918-38916.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114919-54602.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114919-60454.png)
答案
解析
试题分析:
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114919-31519.png)
设
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114919-98505.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114920-88033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114920-81541.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114920-40850.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114920-76558.png)
由于数列中各项均为正,所以
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114921-79889.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114921-90541.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114921-51711.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114921-51125.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114922-77287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114922-66746.png)
巧解:由于
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114922-94472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114922-39437.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114922-37432.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114923-99513.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114830-41496.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114831-23094.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114831-37241.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114831-96940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114831-18350.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114832-63094.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114830-41496.png)
(2)求证:对
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114832-95934.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114832-75441.png)
(3)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114832-69237.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114738-57596.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114738-15123.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114739-21433.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114739-14199.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114739-70660.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114740-78871.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114740-77160.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114740-60937.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114740-81580.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114741-94786.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114741-80940.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114704-83032.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114704-93542.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114704-83032.png)
(Ⅱ)当
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114705-73086.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114705-74007.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114637-71444.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114637-65880.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114637-31139.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114637-99178.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114638-50378.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114604-33648.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114604-62434.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114604-86771.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114604-33648.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114604-35704.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114605-10502.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114605-30003.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114605-72441.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114605-47052.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114605-69798.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114606-92741.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009114606-41375.png)
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