题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050952-79337.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-37199.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-20531.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-33489.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-47662.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-20531.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-33489.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-87489.jpg)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-59701.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-20531.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-33489.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-59701.gif)
由切线长相等得PA=PB,
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-20531.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-20531.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-33489.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-33489.gif)
从而P
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-20531.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-33489.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-20531.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-33489.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-20531.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-33489.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-20531.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-33489.gif)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-20531.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-33489.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-59701.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-41101.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-20531.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-41101.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-47662.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-33489.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-47662.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-41101.gif)
代入得(
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-41101.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-47662.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-47662.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-41101.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-59701.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-41101.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-59701.gif)
即C点横坐标为
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-59701.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050953-59701.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050943-91335.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050943-17648.png)
A.
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050944-39084.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050944-87953.png)
C.
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050944-79367.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050944-39243.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050940-34715.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050940-70073.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050935-93340.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050935-32781.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050935-61838.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050935-93340.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050930-91986.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050931-65894.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050931-49128.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024050931-81930.gif)
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