ÑîÆÖ
25. ÒÑÖªÔ²OµÄ°ë¾¶³¤Îª2£¬µãA¡¢B¡¢CΪԲOÉÏÈýµã£¬ÏÒBC=AO£¬µãDΪBCµÄÖеã. £¨1£©Èçͼ1£¬Áª½áAC¡¢OD£¬Éè?OAC??£¬ÇëÓÃ?±íʾ¡ÏAOD£» £¨2£©Èçͼ2£¬µ±µãBΪACµÄÖеãʱ£¬ÇóµãA¡¢DÖ®¼äµÄ¾àÀ룻
£¨3£©Èç¹ûADµÄÑÓ³¤ÏßÓëÔ²O½»ÓÚµãE£¬ÒÔOΪԲÐÄ£¬ADΪ°ë¾¶µÄÔ²ÓëÒÔBCΪֱ¾¶µÄ
Ô²ÏàÇУ¬ÇóÏÒAEµÄ³¤.
³¤Äþ
25.£¨±¾ÌâÂú·Ö14·Ö£¬µÚ£¨1£©Ð¡Ìâ4·Ö£¬µÚ£¨2£©Ð¡Ìâ4·Ö£¬µÚ£¨3£©Ð¡Ìâ6·Ö£©
Èçͼ7£¬ÔÚRt?ABCÖУ¬?ACB?90?£¬AC?3£¬BC?4£¬µãPÔÚ±ßACÉÏ£¨µãPÓëµãA²»Öغϣ©£¬ÒÔµãPΪԲÐÄ£¬PAΪ°ë¾¶×÷¡ÑP½»±ßABÓÚÁíÒ»µãD£¬ED?DP£¬½»±ßBCÓÚµãE£® (1) ÇóÖ¤£ºBE?DE£»
(2) ÈôBE?x£¬AD?y£¬Çóy¹ØÓÚxµÄº¯Êý¹ØÏµÊ½²¢Ð´³ö¶¨ÒåÓò£»
(3) ÑÓ³¤ED½»CAµÄÑÓ³¤ÏßÓÚµãF£¬Áª½áBP£¬Èô?BDPÓë?DAFÏàËÆ£¬ÇóÏß¶ÎADµÄ³¤£®
ͼ7
C
P
A
C
±¸ÓÃͼ
A
C ±¸ÓÃͼ
A
E
D
B B B »ÆÆÖ
¼Î¶¨
¾²°²
Ëɽ