å CEå¹³åâ ACF,â³ABC为çè¾¹ä¸è§å½¢,æ以â ACF=120度ï¼â ACE=â ECF=60度
å CE=BDï¼â ABD=â ACE=60度,AB=AC,æ以â³ABD å
¨çâ³ACE ï¼æ以AD=AE
å¨ BC延é¿çº¿ä¸ åä¸ç¹Fï¼ä½¿BD=CF,è¿æ¥EF,
å CE=BD,æ以CE=CFï¼
åå â ECF=60度ï¼æ以â CFE=60度=â CEF,æ以â³CEFæ¯çè¾¹ä¸è§å½¢ï¼å¯å¾CE=EF
å BD=CF,æ以BD+DC=DC+CF,BC=DF,
åå BC=AC,æ以AC=DF
å AC=DFï¼â CFE=â ACE=60度CE=CF,æ以â³ACE å
¨çâ³DEF,å¯å¾AE=DE
æ以â³ADEæ¯çè¾¹ä¸è§å½¢ã
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