应该是AB = AC吧过D做DG//AC交BC于G∴∠DGB = ∠ACB∵∠DGB =∠DFB +∠GDF∠ACB = ∠CFE + ∠E∠DFB = ∠CFE∴∠E = ∠GDF∵AB = AC∴∠B = ∠ACB∴∠B = ∠DGB∴DB = DG∵BD = CE∴DG = CE∴△GDF≌△CEF∴DF = FE...
如图,△ABC中,AD=AC,D在AB上,E在AC的延长线上,且BD=CE,连接DE交BC与F,求证:DF=EF
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