(1)∵BD⊥AD,CE⊥AD
∴∠ABD+∠BAD=90° ∠ADB=∠AEC
∵∠BAC=∠BAD+∠EAC=90°
∴∠DBA=∠EAC
∵∠ADB=∠AEC ∠DBA=∠EAC AB=AC
∴△ABD≌△CAE(AAS)
∴BD=AE AD=EC
(2)BD=CE+ED
理由:AE=BD=AD+ED=EC+ED
不懂,祝愉快
(1)∵BD⊥AD,CE⊥AD
∴∠ABD+∠BAD=90° ∠ADB=∠AEC
∵∠BAC=∠BAD+∠EAC=90°
∴∠DBA=∠EAC
∵∠ADB=∠AEC ∠DBA=∠EAC AB=AC
∴△ABD≌△CAE(AAS)
∴BD=AE AD=EC
(2)BD=CE+ED
理由:AE=BD=AD+ED=EC+ED
不懂,祝愉快