1 . 如图,AB、PA、PBC分别为⊙O的切线和割线,切点A是BD的中点,AC、BD相交于点E,AB、PE相交于点F,直线CF交⊙O于另一点G、交PA于点K.
![](https://img.xkw.com/dksih/QBM/2018/12/10/2093858078851072/2094692238008320/STEM/13256ee9e28d41c2b8e932dbeae5c66c.png?resizew=317)
证明:(1)K是PA的中点;(2)
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![](https://img.xkw.com/dksih/QBM/2018/12/10/2093858078851072/2094692238008320/STEM/13256ee9e28d41c2b8e932dbeae5c66c.png?resizew=317)
证明:(1)K是PA的中点;(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf12f102fb4d9aba7097f5885f967f25.png)
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2018-12-11更新
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205次组卷
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2卷引用:陕西省渭南市韩城市2019-2020学年高二上学期竞赛考试数学试题