题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050835-84943.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050835-42212.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050836-94560.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050836-92583.png)
(2)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050835-84943.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050836-23716.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050836-96094.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050836-42342.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050837-81738.png)
①—②得
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050837-86841.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050837-31836.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050837-71465.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050838-97141.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050838-40761.png)
解析
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050830-55268.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050831-26675.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050831-82838.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050831-14787.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050830-55268.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050831-95317.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050832-32726.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050820-41425.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050821-48586.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050821-48711.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050820-41425.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050821-16441.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050821-87016.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050821-48586.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050821-57290.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050811-87983.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050811-53995.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050811-92562.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050812-76863.png)
设数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050801-42909.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050801-74331.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050801-37761.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050801-58552.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050801-30014.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050802-97366.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050802-14027.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050802-87769.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050802-52770.png)
(2)若数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050801-42909.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050803-39414.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050803-83216.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050803-67249.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050803-21548.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050803-20914.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050804-51205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050804-19562.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050804-66634.png)
(3)设数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050804-46829.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050804-33701.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050805-12229.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050804-46829.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050801-74331.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050805-77527.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050805-27732.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050805-97838.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050805-77527.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050750-59043.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050750-24998.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050751-52397.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050751-28495.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050751-14114.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050750-24998.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050751-46260.png)
(2)记
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050751-89556.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050752-44884.png)
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