题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064026-69414.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064026-40890.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064026-81124.gif)
(Ⅰ)求证:数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064027-67624.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064027-84732.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064027-87762.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064027-67059.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064027-10173.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064028-74850.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064028-22655.gif)
∴数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064027-67624.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064028-20640.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064028-11914.gif)
(Ⅱ) 由(Ⅰ)知
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064028-14140.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064029-35042.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064029-89840.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064027-84732.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064029-64876.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064029-37615.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064029-59227.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064030-40289.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064030-83599.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064027-67059.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064019-58732.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064019-69303.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064019-33809.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064020-84939.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064020-48255.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064020-80932.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064006-25835.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064006-65966.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064006-59384.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064007-18557.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064006-25835.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064007-95874.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064007-95642.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064007-76171.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064007-48315.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013064008-53190.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063932-68613.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063932-84771.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063932-86328.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063933-93328.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063932-68613.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063933-68235.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063933-33075.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063933-33126.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063933-68235.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063932-84771.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063933-62243.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063934-37068.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063922-63845.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063922-55026.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063922-66060.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063922-18371.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063922-40025.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063923-91964.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063922-18371.gif)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063923-90332.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063923-74885.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063923-63391.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063924-99361.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063924-33858.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063912-17666.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063913-38122.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063912-17666.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063913-38616.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063913-28306.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063913-76184.gif)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063912-17666.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063914-62492.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063914-58652.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063913-38616.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013063914-33251.gif)
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