题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090223-25096.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090224-30997.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090224-40896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090224-16078.png)
(I)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090224-20829.png)
(II)若直线
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090225-44122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090224-30997.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090225-60362.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090225-37122.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090225-37122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090225-66224.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090226-45033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090226-78575.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090227-22201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090227-91432.png)
(II) 焦点
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090225-60362.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090225-44122.png)
设直线
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090225-44122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090227-56773.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090227-94439.png)
(1)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090227-10979.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090226-45033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090226-78575.png)
直线
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090228-91856.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090228-40945.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090228-53220.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090228-97006.png)
①-②得:点
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090229-54619.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090229-56205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090224-20829.png)
(2)焦点
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090225-60362.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090225-44122.png)
设直线
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090225-44122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090227-56773.png)
将直线
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090225-44122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090229-32036.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090229-79540.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090230-54198.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090230-22465.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090230-87318.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090230-77005.png)
,从而点
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090229-54619.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090225-44122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090231-74156.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090231-49347.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090231-21183.png)
故
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090225-37122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090225-66224.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090217-33144.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090217-12720.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090217-57493.png)
已知等差数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090200-85261.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090200-61510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090201-76345.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090201-32116.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090201-70081.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090201-85201.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090200-85261.png)
(2)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090201-82651.png)
(3)是否存在正整数
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090202-16950.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090202-76552.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090202-94452.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090203-23522.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090201-85201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090202-16950.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090136-54850.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090136-47716.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090136-97855.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090137-97251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090143-82780.jpg)
已知数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090123-66024.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090124-92242.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090124-33895.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090124-23920.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090124-91308.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090125-16521.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090125-81324.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090125-51415.png)
(3)设
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090125-20321.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090125-25201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090126-49475.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090126-49475.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090126-28623.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090126-88311.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090126-49475.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090126-28623.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090048-39337.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090049-12446.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090049-59657.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090049-90181.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090049-79653.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010090050-85392.png)
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