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證明:在△ABD和△ACD中 AB = AC BD = CD AD = AD ∴△ABD≌△ACD(SSS) ∴∠1 =∠2 在△ABE和△ACE中 AB = AC ∠1 =∠2 AE = AE ∴△ABE≌△ACE(SAS) ∴EB = EC
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