[中學] 證明
幫弟弟發問 他要考師大附中科學班
已知三角形ABC 若AB>AC 作AT平分角A交BC於T點
在AB線上取一點P作PQ平行AT交BC於Q點
取PB線上一點F作射線FC 在取AC線上一點E作射線BE
BE FC PQ交於點D
試證 BF=EC
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