在RT三角形ABC中,BC=9,CA=12,角ABC的平分线BD交AC与点D,DE垂直DB交AB于点E(1)设圆O是三角形BDE的外接圆,求证AC是圆O的切线(已证)(2)设圆O交BC于点F,连接EF,求EF/AC的值.第二问写详细点,顺便说说
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![在RT三角形ABC中,BC=9,CA=12,角ABC的平分线BD交AC与点D,DE垂直DB交AB于点E(1)设圆O是三角形BDE的外接圆,求证AC是圆O的切线(已证)(2)设圆O交BC于点F,连接EF,求EF/AC的值.第二问写详细点,顺便说说](/uploads/image/z/4317979-67-9.jpg?t=%E5%9C%A8RT%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2CBC%3D9%2CCA%3D12%2C%E8%A7%92ABC%E7%9A%84%E5%B9%B3%E5%88%86%E7%BA%BFBD%E4%BA%A4AC%E4%B8%8E%E7%82%B9D%2CDE%E5%9E%82%E7%9B%B4DB%E4%BA%A4AB%E4%BA%8E%E7%82%B9E%EF%BC%881%EF%BC%89%E8%AE%BE%E5%9C%86O%E6%98%AF%E4%B8%89%E8%A7%92%E5%BD%A2BDE%E7%9A%84%E5%A4%96%E6%8E%A5%E5%9C%86%2C%E6%B1%82%E8%AF%81AC%E6%98%AF%E5%9C%86O%E7%9A%84%E5%88%87%E7%BA%BF%EF%BC%88%E5%B7%B2%E8%AF%81%EF%BC%89%EF%BC%882%EF%BC%89%E8%AE%BE%E5%9C%86O%E4%BA%A4BC%E4%BA%8E%E7%82%B9F%2C%E8%BF%9E%E6%8E%A5EF%2C%E6%B1%82EF%2FAC%E7%9A%84%E5%80%BC.%E7%AC%AC%E4%BA%8C%E9%97%AE%E5%86%99%E8%AF%A6%E7%BB%86%E7%82%B9%2C%E9%A1%BA%E4%BE%BF%E8%AF%B4%E8%AF%B4)
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