题目
题型:不详难度:来源:
已知直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003341-79942.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003342-88499.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003342-26114.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003342-37627.gif)
(Ⅰ)当
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003342-13242.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003343-96837.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003343-93515.gif)
(Ⅱ)若直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003343-96837.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003343-93515.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003343-96837.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003342-13242.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003343-96837.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003343-12220.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003343-93515.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003343-76141.gif)
圆心(0,0)到直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003343-96837.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003344-41275.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003343-96837.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003343-93515.gif)
(Ⅱ)若直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003343-96837.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003343-93515.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003343-96837.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003344-29391.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003344-90396.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003343-96837.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003344-23969.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003344-56641.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003345-15637.gif)
所以,直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003343-96837.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003345-24406.gif)
解析
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003333-69294.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003333-44677.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003333-64740.png)
A.–1或![]() | B.1或3 | C.–2或6 | D.0或4 |
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003327-18081.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003327-30113.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003327-51989.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003328-79129.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003328-34756.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003322-66833.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003314-40734.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003314-63563.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003314-89001.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003315-50921.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003315-95170.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003315-42949.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003315-68437.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003316-57600.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003316-27531.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003316-58886.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003316-58886.gif)
(3)若DE是圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003316-58886.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003316-34376.gif)
若是,求出定值;若不是,请说明理由.
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003308-74825.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003308-71439.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003309-96590.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003309-14226.png)
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