Question

Èçͼ£¬ÔÚÌÝÐÎABCDÖУ¬AD¡ÎBC£¬AB£½5£¬AD£½6£¬DC£½4£¬¡ÏC£½45º. ¶¯µãM´ÓBµã³ö·¢ÑØÏ߶ÎBCÒÔÿÃë1¸öµ¥Î»³¤¶ÈµÄËÙ¶ÈÏòÖÕµãCÔ˶¯£»¶¯µãNͬʱ´ÓCµã³ö·¢ÑØC¡úD¡úAÔ˶¯£¬ÔÚCDÉϵÄËÙ¶ÈΪÿÃë¸öµ¥Î»³¤¶È£¬ÔÚDAÉϵÄËÙ¶ÈΪÿÃë1¸öµ¥Î»³¤¶È£¬µ±ÆäÖÐÒ»¸öµãµ½´ïÖÕµãÊÇÁíÒ»¸öµãÒ²Ëæֹ֮ͣÔ˶¯.ÉèÔ˶¯µÄʱ¼äΪtÃ룮

£¨1£©ÇóBCµÄ³¤£®
£¨2£©µ±ËıßÐÎABMNÊÇƽÐÐËıßÐÎʱ£¬ÇótµÄÖµ£®
£¨3£©ÊÔ̽¾¿£ºtΪºÎֵʱ£¬¡÷ABMΪµÈÑüÈý½ÇÐΣ®

Answer 1

¼û½âÎö

½âÎöÊÔÌâ·ÖÎö:£¨1£©BC£½13 ¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­£¨2·Ö£©
£¨2£©ÓÉÌâÒ⣬µãN±ØÔÚDAÉÏ£¬ÇÒBM£½AN¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­£¨3·Ö£©
´Ót£½6£­(t£­4)½âµÃt£½5 ¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­£¨5·Ö£©
£¨3£©µ±BA£½BMʱ£¬t£½5¡­¡­¡­¡­¡­£¨6·Ö£©£»µ±AB£½AMʱ£¬t£½6¡­¡­¡­¡­¡­£¨7·Ö£©
µ±MA£½MBʱ£¬ÓÉt²£½(t£­3)²£«4²£¬µÃt£½¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­£¨9·Ö£©
¿¼µã£º µÈÑüÈý½ÇÐÎÐÔÖʶ¨ÀíºÍƽÐÐËıßÐεÄÐÔÖÊ¡£
µãÆÀ£º ±¾ÀàÊÔÌâҪעÒâ֪ʶµãµÄôۺϿ¼²é¡£µÈÑüÈý½ÇÐÎ×¢Ò⣺ͬһÈý½ÇÐÎÖУ¬ÓÐÁ½Ìõ±ßÏàµÈµÄÈý½ÇÐÎÊǵÈÑüÈý½ÇÐΡ£ ÔÚͬһÈý½ÇÐÎÖУ¬ÓÐÁ½¸ö½ÇÏàµÈµÄÈý½ÇÐÎÊǵÈÑüÈý½ÇÐÎ