å¯ä»¥æ±å¾ AD=5ï¼è¿DåDEåç´äºABï¼é£ä¹ DE=4 AE=3 ç´è§ä¸è§å½¢ï¼
å
å§AP å DP è¿æ¥èµ·æ¥
设 BP = X
ç´è§ä¸è§å½¢ ABPä¸ 4^2 + X^2= AP^2
ç´è§ä¸è§å½¢ DCPä¸ 1 + (4-X)^2= PD^2
å¦æAPåç´äºPD é£ä¹ AP^2 +DP^2= AD^2 = 25
é£ä¹å°±æ¯ 16 + X^2 + 1 + (4-X)^2 = 25
æååç® X^2 - 4X + 4 = 0
å¾ X= 2
æ解 说æåå¨ç¹P 使å¾APåç´äºPD ä½äºBCçä¸ç¹ BP=CP=2
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