百度史上最难数学题!I是ABC的内心,圆I是以I为圆心作的任意一圆,过I分别作BC,AC,AB的垂线,分别与圆I交于点D,E,F,求证:AD,BE,CF共点.请自己画.题目绝对没打错,画不出图的就不要捣乱.谁能做出有
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![百度史上最难数学题!I是ABC的内心,圆I是以I为圆心作的任意一圆,过I分别作BC,AC,AB的垂线,分别与圆I交于点D,E,F,求证:AD,BE,CF共点.请自己画.题目绝对没打错,画不出图的就不要捣乱.谁能做出有](/uploads/image/z/774954-18-4.jpg?t=%E7%99%BE%E5%BA%A6%E5%8F%B2%E4%B8%8A%E6%9C%80%E9%9A%BE%E6%95%B0%E5%AD%A6%E9%A2%98%21I%E6%98%AFABC%E7%9A%84%E5%86%85%E5%BF%83%2C%E5%9C%86I%E6%98%AF%E4%BB%A5I%E4%B8%BA%E5%9C%86%E5%BF%83%E4%BD%9C%E7%9A%84%E4%BB%BB%E6%84%8F%E4%B8%80%E5%9C%86%2C%E8%BF%87I%E5%88%86%E5%88%AB%E4%BD%9CBC%2CAC%2CAB%E7%9A%84%E5%9E%82%E7%BA%BF%2C%E5%88%86%E5%88%AB%E4%B8%8E%E5%9C%86I%E4%BA%A4%E4%BA%8E%E7%82%B9D%2CE%2CF%2C%E6%B1%82%E8%AF%81%EF%BC%9AAD%2CBE%2CCF%E5%85%B1%E7%82%B9.%E8%AF%B7%E8%87%AA%E5%B7%B1%E7%94%BB.%E9%A2%98%E7%9B%AE%E7%BB%9D%E5%AF%B9%E6%B2%A1%E6%89%93%E9%94%99%2C%E7%94%BB%E4%B8%8D%E5%87%BA%E5%9B%BE%E7%9A%84%E5%B0%B1%E4%B8%8D%E8%A6%81%E6%8D%A3%E4%B9%B1.%E8%B0%81%E8%83%BD%E5%81%9A%E5%87%BA%E6%9C%89)
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