题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043000-41520.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043000-70630.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043001-42122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043001-31257.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043000-41520.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043001-45536.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043001-14138.png)
小题1:判断直线
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043002-79324.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043000-41520.png)
小题2:当
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043002-27210.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043002-79324.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043002-10198.png)
答案
小题1:直线
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043002-79324.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043000-41520.png)
小题2:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043002-61115.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043002-79324.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043000-41520.png)
证明:∵
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043001-14138.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043003-70375.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043003-56582.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043000-70630.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043001-42122.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043003-72209.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043003-92846.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043004-34906.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043002-79324.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043000-41520.png)
(2)连接
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043004-74920.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043004-30539.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043004-19946.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043005-85739.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043002-27210.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043005-24507.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043005-34067.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043005-52505.png)
由(1),
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043002-79324.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043000-41520.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043006-88976.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043006-50682.png)
由(1)得
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043003-56582.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043006-24207.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043006-69420.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043006-58336.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105043002-61115.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105042955-60947.png)
小题1:证明BF是⊙O的切线;
小题2:设AC与BF的延长线交于点M,若MC=6,求∠MCF的大小.
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105042951-12667.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105042946-58870.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105042942-58523.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105042942-32651.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105042942-89355.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105042943-76561.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105042943-94375.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105042943-25399.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105042943-59589.png)
A.30° | B.35° |
C.40° | D.50° |
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105042934-10869.png)
小题1:求⊙A的半径和b的值;
小题2:判断直线BC与⊙A的位置关系,并说明理由;
小题3:若点P在⊙A上,点Q是y轴上C点下方的一点,当△PQM为等腰直角三角形时,请直接写出满足条件的点Q(0,k)(k为整数)坐标.
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105042934-64516.jpg)
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