ÌâÄ¿ÄÚÈÝ
¡¾ÌâÄ¿¡¿Ä³¼ÒÊóµÄëɫÊܶÀÁ¢ÒÅ´«µÄÁ½¶ÔµÈλ»ùÒò£¨A¡¢a ºÍ B¡¢b£©¿ØÖÆ£¬ÒÑÖª A¡¢B »ùÒòͬʱ´æÔÚʱ ±íÏÖΪºÚÉ«£¬ÆäÓàÇé¿öϾùΪ°×É«£¬ÇÒ»ùÒò B¡¢b ֻλÓÚ X ȾɫÌåÉÏ¡£Ò»Ö»´¿ºÏ°×É«´ÆÊóÓëÒ»Ö»´¿ºÏ°×É«ÐÛÊó½»Å䣬F1ȫΪºÚÉ«¡£ÏÂÁÐÓйطÖÎöÕýÈ·µÄÊÇ
A.Ç×´ú´ÆÐÛÊó²úÉúµÄÅä×Óº¬ÓеĻùÒòÏàͬ
B.F1ÖкÚÉ«´ÆÐÛÊó²úÉúº¬ XB Åä×ӵĸÅÂʲ»Í¬
C.F1ÖкÚÉ«´ÆÐÛÊó½»Å䣬F2ÐÛÊóÖа×É«¸öÌåÕ¼ 5/8
D.F1ÖкÚÉ«´ÆÐÛÊó½»Å䣬F2´ÆÊóÖкÚÉ«¸öÌåÖд¿ºÏ¸öÌåÕ¼ 1/4
¡¾´ð°¸¡¿C
¡¾½âÎö¡¿
·ÖÎöÌâÎÄÃèÊö¿ÉÖª£ºAºÍa¡¢BºÍbµÄÒÅ´«×ñÑ»ùÒòµÄ×ÔÓÉ×éºÏ¶¨ÂÉ¡£Ä³¼ÒÊóµÄºÚëΪA_XBX_¡¢A_XBY£¬°×ëΪA_XbXb¡¢A_XbY¡¢aaXBX_¡¢aaXBY¡¢aaXbXb¡¢aaXbY¡£
A¡¢ÒÀÌâÒâ¿ÉÖª£ºÒ»Ö»´¿ºÏ°×É«´ÆÊóµÄ»ùÒòÐÍΪAAXbXb»òaaXBXB»òaaXbXb£¬Ò»Ö»´¿ºÏ°×É«ÐÛÊóµÄ»ùÒòÐÍΪAAXbY»òaaXBY»òaaXbY£¬¶þÕß½»Å䣬F1ȫΪºÚÉ«£¬ËµÃ÷Ç×´ú´ÆÊóµÄ»ùÒòÐÍΪaaXBXB£¬²úÉúµÄ´ÆÅä×ӵĻùÒòÐÍΪaXB£¬Ç×´úÐÛÊóµÄ»ùÒòÐÍΪAAXbY£¬²úÉúµÄÐÛÅä×ӵĻùÒòÐÍΪAXb¡¢AY£¬¿É¼û£¬Ç×´ú´ÆÐÛÊó²úÉúµÄÅä×Óº¬ÓеĻùÒò²»Í¬£¬A´íÎó£»
B¡¢F1ÖкÚÉ«´ÆÐÛÊóµÄ»ùÒòÐÍ·Ö±ðΪAaXBXb¡¢AaXBY£¬²úÉúº¬ XB Åä×ӵĸÅÂÊÏàͬ£¬¶¼ÊÇ1/2£¬B´íÎó£»
C¡¢F1ÖкÚÉ«´ÆÐÛÊó½»Å䣬F2ÐÛÊóÖа×É«¸öÌåÕ¼1£3/4 A_¡Á1/2XBY£½5/8£¬CÕýÈ·£»
D¡¢F1ÖкÚÉ«´ÆÐÛÊó½»Å䣬F2´ÆÊóÖкÚÉ«¸öÌåµÄ»ùÒòÐͼ°Æä±ÈÀýΪAAXBXB¡ÃAaXBXB¡ÃAAXBXb¡ÃAaXBXb£½1¡Ã2¡Ã1¡Ã2£¬ÆäÖд¿ºÏ¸öÌåÕ¼ 1/6£¬D´íÎó¡£
¹ÊÑ¡C¡£