⑴∵∠D=∠E=90°
AB=AC,AD=CE
∴△ABD≌△CAE
∴∠BAD=∠ACE
∴∠BAD+∠CAE=∠ACE+∠CAE=90°
∴∠BAC=90°
∴BA⊥AC
⑵与⑴差不多,先证明△ABD≌△CAE
得∠BAD=∠ACE
∴∠BAC=∠BAD+∠CAE=∠ACE+∠CAE=90°
∴BA⊥AC
⑴∵∠D=∠E=90°
AB=AC,AD=CE
∴△ABD≌△CAE
∴∠BAD=∠ACE
∴∠BAD+∠CAE=∠ACE+∠CAE=90°
∴∠BAC=90°
∴BA⊥AC
⑵与⑴差不多,先证明△ABD≌△CAE
得∠BAD=∠ACE
∴∠BAC=∠BAD+∠CAE=∠ACE+∠CAE=90°
∴BA⊥AC