(1)∵BD⊥AE于D,CE⊥AE
∴∠ADB=∠AEC=90°,
又∵∠BAC=90°
∴∠BAD+∠EAC=90°,∠ACE+∠EAC=90°
∴∠BAD=∠ACE
在△ABD与△CAE中
∠BAD=∠ACE
∠ADB=∠AEC
AB=AC
∴△ABD≌△CAE.(AAS)
∴AD=CE
(2)BD=DE+CE;
理由:∵△ABD≌△CAE
∴BD=AE,AD=EC
∵AE=AD+DE
∴BD=DE+CE.
(1)∵BD⊥AE于D,CE⊥AE
∴∠ADB=∠AEC=90°,
又∵∠BAC=90°
∴∠BAD+∠EAC=90°,∠ACE+∠EAC=90°
∴∠BAD=∠ACE
在△ABD与△CAE中
∠BAD=∠ACE
∠ADB=∠AEC
AB=AC
∴△ABD≌△CAE.(AAS)
∴AD=CE
(2)BD=DE+CE;
理由:∵△ABD≌△CAE
∴BD=AE,AD=EC
∵AE=AD+DE
∴BD=DE+CE.