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證明:延長FD到點M使MD=FD,連接BM,EM,∵D為BC的中點,∴BD=CD,在△FDC和△MDB中,FD=DM∠FDC=∠MDBCD=BD,∴△FDC≌△MDB(SAS),∴BM=CF,又∵FD=DM,ED⊥MF,∴ED是MF的中垂線∴EF=EM,在△EBM中,BE+ BM>…
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