题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021203-22239.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021203-68965.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021203-63803.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021204-62113.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021204-61233.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021204-32148.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021204-27713.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021203-68965.png)
(2)过点
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021204-22146.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021203-68965.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021204-27713.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021204-24896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021204-29686.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021204-71678.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021204-86577.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021204-27713.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021203-68965.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021204-55272.png)
解析
试题分析:1)证明:如图(13),连结
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021205-68896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021205-97454.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021205-21110.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021205-87874.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021205-42914.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021205-80597.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021205-58485.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021203-68965.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021206-32900.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021206-94494.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021204-27713.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021203-68965.png)
(2)解:∵
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021206-59721.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021206-93246.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021206-18975.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021206-70218.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021206-41009.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021207-99082.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021207-77389.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021207-65919.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021207-50420.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021203-68965.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021207-89629.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021207-34884.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021208-14223.png)
解得
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021204-55272.png)
点评:本题考查直线与圆相切,要求考生掌握直线与圆的位置关系,并能利用相关知识来判定直线与圆的位置关系
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021154-70112.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021154-11069.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021154-42985.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021154-19513.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021154-13331.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021155-31980.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021155-88788.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021154-13331.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021155-21046.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021154-13331.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021155-81721.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021155-10430.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021155-88788.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021156-71663.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021155-31980.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021156-85943.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021156-71675.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021156-87821.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021156-36077.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021156-70888.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021156-37480.png)
(3)在点
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021154-13331.png)
①当
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021156-76705.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021154-13331.png)
②当
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021157-58723.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021154-13331.png)
A.![]() | B.15![]() | C.![]() | D.75![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021144-93552.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021144-19102.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021140-20153.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021141-68823.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021128-29295.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021128-83250.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021128-37559.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021128-83250.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021128-37559.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021128-33344.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021129-65122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021129-66674.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021129-42620.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021130-19178.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021130-13039.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021129-65122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021130-76476.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021130-97440.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021130-13039.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021131-73779.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021131-27224.png)
(1)求点
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021129-42620.png)
(2)连结
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021131-71160.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021131-53523.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021132-75644.png)
(3) 如图10-2,过点
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021132-35913.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021128-83250.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021128-37559.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021132-47585.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021132-35158.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021128-83250.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021132-12291.png)
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