1 . 如图所示,AD,AE,BC分别与圆O切于点D,E,F,延长AF与圆O交于另一点G.给出下列三个结论:
![](https://img.xkw.com/dksih/QBM/2014/6/19/1571781564129280/1571781568995328/STEM/28d329d25c62400f99b626d9ea259f05.png?resizew=239)
①AD+AE=AB+BC+CA;
②AF·AG=AD·AE;
③△AFB∽△ADG.
其中正确结论的序号是( )
![](https://img.xkw.com/dksih/QBM/2014/6/19/1571781564129280/1571781568995328/STEM/28d329d25c62400f99b626d9ea259f05.png?resizew=239)
①AD+AE=AB+BC+CA;
②AF·AG=AD·AE;
③△AFB∽△ADG.
其中正确结论的序号是( )
A.①② | B.②③ | C.①③ | D.①②③ |
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2016-11-30更新
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2卷引用:2011年普通高中招生考试北京市高考理科数学
真题
2 . 如图,过圆
外一点
分别作圆的切线和割线交圆于
.且
,
是圆上一点使得
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88bee8e70f1fab639be1636c7bce0477.png)
_____ .
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a185fc6d3bb58b53cdc551924aabf379.png)
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