解答题-证明题 适中0.65 引用1 组卷91
如图,
与
相交于
两点,过点
作
的切线交
于点
,过点
作两圆的割线, 分别交
,
于点
,
与
相交于点
.
![](https://img.xkw.com/dksih/QBM/2016/6/21/1572758564175872/1572758570885120/STEM/4cc7d25d0579466bbf8c69157d7519d3.png)
(1)求证:
;
(2)若
是
的切线, 且
,求
的长.
![](https://img.xkw.com/dksih/QBM/2016/6/21/1572758564175872/1572758570885120/STEM/88144f850d54414c9db42544d5b44cec.png)
![](https://img.xkw.com/dksih/QBM/2016/6/21/1572758564175872/1572758570885120/STEM/1d8ad8bdd608468c8d838893aa9fb030.png)
![](https://img.xkw.com/dksih/QBM/2016/6/21/1572758564175872/1572758570885120/STEM/4cc7d25d0579466bbf8c69157d7519d3.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2016/6/21/1572758564175872/1572758570885120/STEM/7b246ae9a7d44c02a047884a2202c994.png)
(2)若
![](https://img.xkw.com/dksih/QBM/2016/6/21/1572758564175872/1572758570885120/STEM/e08579b67b404c5b81fc2b98cbdcf79c.png)
![](https://img.xkw.com/dksih/QBM/2016/6/21/1572758564175872/1572758570885120/STEM/34a74c80d05d49ae839d265ab882b824.png)
![](https://img.xkw.com/dksih/QBM/2016/6/21/1572758564175872/1572758570885120/STEM/e08579b67b404c5b81fc2b98cbdcf79c.png)
15-16高二下·河北石家庄·阶段练习
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