延长AC交BN于点F.在△ABC和△FBC中,∠ACB = 90°= ∠FCB ,BC为公共边,∠ABC = ∠FBC ,所以,△ABC ≌ △FBC ,可得：AB = FB ,AC = FC ；则有：∠BFA = ∠BAF = ∠FAD .在△ACD和△FCE中,∠ACD = ∠FCE ,AC = FC ,∠CA...