âµBDå¹³åâ ABC
â´â EBD=â DBC
âµEFâ¥BC
â´â EDB=â DBC
â´â EBD=â EDB
â´EB = ED
åçå¯å¾ï¼FD=FC
â´ED+DF = EB + FC
å³ EF = EB + FC .è¿åºè¯¥å°±æ¯è¦è¯æçç»è®ºï¼ï¼ææçæ¨é¢ç®å°±æ¯è¦è¯æçè¿ä¸ªåï¼æ¨æ ¸å®ä¸ä¸ãï¼
èæ¨é¢ç®é®çæ¯ âå¤æ线段EFåCFçå
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é£ä¹ï¼ç± EF = EB + FC å½ç¶å¾ EF ï¼ FC å¦ï¼
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