∵∠ACE+∠FCB=90° ∠FCB+∠CBF=90°∴∠ACE=∠CBF∵AE⊥CE,CF⊥BF∴∠AEC=∠CFB=90°∵AC=CB∴△ACE≌△CBF∴AE=CF,CE=FB∵CF=CE+EF∴AE=EF+BF是否可以解决您的问题?