过点B作BG⊥BC,交CE的延长线于点G.在△ACD和△CBG中,∠CAD = 90°-∠ADC = ∠BCG ,AC = CB ,∠ACD = 90°= ∠CBG ,所以,△ACD ≌ △CBG ,可得：CD = BG ,∠ADC = ∠CGB .在△BEG和△BED中,BG = CD = BD ,∠GBE = 45...