题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065405-45434.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065405-27546.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065405-61973.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065405-87531.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065406-53569.gif)
①求
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065405-45434.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065406-45233.gif)
②若
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065406-98443.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065406-90422.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065406-98443.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065406-47257.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065407-34318.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065407-12930.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065407-29736.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065407-88278.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065407-31573.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065406-47257.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065407-34318.gif)
又∵
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065408-72945.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065408-27962.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065408-87773.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065408-61441.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065409-29854.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065407-12930.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065337-95978.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065326-20160.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065326-15701.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065327-19899.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065327-41636.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065310-60530.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065310-16212.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065310-34748.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065310-62677.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065310-82986.gif)
(Ⅰ)若数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065311-62802.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065311-74381.gif)
(Ⅱ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065310-60530.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065311-60751.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013065311-77318.gif)
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