在三角形ABC中,AB=AC=12,BC=6,点D在边AB上,点E在边CD上,且角BEC=角 ACB,BE的延长线与边AC相交于点F.若三角形DBC相似于三角形BEC相似于三角形BCF,AF=(108-12AD)/12-AD,若AD=3,求线段BF的长.
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![在三角形ABC中,AB=AC=12,BC=6,点D在边AB上,点E在边CD上,且角BEC=角 ACB,BE的延长线与边AC相交于点F.若三角形DBC相似于三角形BEC相似于三角形BCF,AF=(108-12AD)/12-AD,若AD=3,求线段BF的长.](/uploads/image/z/5897777-41-7.jpg?t=%E5%9C%A8%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2CAB%3DAC%3D12%2CBC%3D6%2C%E7%82%B9D%E5%9C%A8%E8%BE%B9AB%E4%B8%8A%2C%E7%82%B9E%E5%9C%A8%E8%BE%B9CD%E4%B8%8A%2C%E4%B8%94%E8%A7%92BEC%3D%E8%A7%92+ACB%2CBE%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%B8%8E%E8%BE%B9AC%E7%9B%B8%E4%BA%A4%E4%BA%8E%E7%82%B9F.%E8%8B%A5%E4%B8%89%E8%A7%92%E5%BD%A2DBC%E7%9B%B8%E4%BC%BC%E4%BA%8E%E4%B8%89%E8%A7%92%E5%BD%A2BEC%E7%9B%B8%E4%BC%BC%E4%BA%8E%E4%B8%89%E8%A7%92%E5%BD%A2BCF%2CAF%3D%28108-12AD%29%2F12-AD%2C%E8%8B%A5AD%3D3%2C%E6%B1%82%E7%BA%BF%E6%AE%B5BF%E7%9A%84%E9%95%BF.)
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