解ï¼è§ä¸å¾ï¼åç´è§ä¸è§å½¢ABCï¼â A=90Dï¼åå«ä»¥aï¼bï¼c为â Aï¼â Bï¼â Cç对边ã
ä¸é¢ä½å¾ï¼a^2-b^2=(a+b)(a-b)=c^2(å¾è¡å®çï¼
1ã以C为åå¿ï¼ä»¥b为åå¾ä½åååå«äº¤BCäºHï¼äº¤BC延é¿çº¿äºDï¼
2ã以B为åå¿ï¼ä»¥BF为åå¾ååï¼åå«äº¤BCäºFï¼äº¤BCåå延é¿çº¿äºEï¼
3ãå¨çº¿æ®µEDä¸éåä¸ç¹Oï¼ä½EDçåç´å¹³å线交äºOï¼ï¼
4ã以ED/2为åå¾ä½åO交EDåå«äºEåDï¼
5ãä½BGâ¥EDï¼äº¤åOäºGï¼
6ã以B为åå¿ï¼ä»¥AB=c为åå¾åå交åOäºGï¼åæBG=AB=cãå°æ¤ä½å¾å®æ¯ã
å 为BGæ¯EBåBDçæ¯ä¾ä¸é¡¹ï¼æ以æï¼
c^2=BG^2=EB*BD=BF*BD=(a-b)(BF+FC+CD)=(a-b)(a+b)=a^2-b^2ãè¯æ¯ã
å¾ä¸ç以ä¸è§å½¢ABCçè¾¹é¿ä¸ºæ£æ¹å½¢çè¾ å©çº¿ä½ä¸ºè¯é¢çåèã
请å¨æ¤è¾å
¥æ¨çåç