题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050112-23882.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050112-83833.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050112-68102.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050113-78721.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050113-53086.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050113-61201.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050113-98151.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050113-20135.gif)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050114-12365.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050114-41024.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050112-83833.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050114-42150.gif)
答案
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050114-80807.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050114-65895.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050115-18851.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050115-20974.gif)
解析
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050114-80807.gif)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050115-97667.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050115-43584.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050116-98449.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050116-87823.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050116-85110.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050116-50296.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050113-98151.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050116-29271.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050117-10317.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050117-72118.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050117-50949.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050114-65895.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050117-13898.gif)
令
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050117-88122.gif)
记
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050118-18145.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050118-77428.gif)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050118-47006.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050118-74487.gif)
相减,故
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050119-91310.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050119-30839.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050119-42589.gif)
故
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050119-70032.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050115-20974.gif)
核心考点
举一反三
小题1:
3.在数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050102-26857.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050102-43797.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050102-96018.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050103-67916.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050103-12834.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050103-85971.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050102-43797.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050103-55709.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050103-92770.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050104-87150.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050102-43797.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050104-86378.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050050-31743.gif)
(I)求
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050050-28501.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050050-74525.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050042-64900.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050042-66224.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050042-57771.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050042-13019.gif)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050036-28507.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050036-76100.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050037-81749.gif)
A.![]() | B.![]() | C.![]() | D.无穷多个 |
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050029-99460.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050030-68520.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050030-44570.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013050030-36466.gif)
A.![]() | B.![]() | C.![]() | D.![]() |
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