ÌâÄ¿ÄÚÈÝ

12£®¸ÊÀ¶ÐÍÓͲ˻¨É«ÐÔ×´ÓÉÈý¶ÔµÈλ»ùÒò¿ØÖÆ£¬Èý¶ÔµÈλ»ùÒò·Ö±ðλÓÚÈý¶ÔͬԴȾɫÌåÉÏ£®»¨É«±íÏÖÐÍÓë»ùÒòÐÍÖ®¼äµÄ¶ÔÓ¦¹ØÏµÈç±í£®Çë»Ø´ðÏÂÁÐÎÊÌ⣺
±íÏÖÐͰ׻¨Èé°×»¨»Æ»¨½ð»Æ»¨
»ùÒòÐÍAA____Aa____aaB___¡¢aa__D_aabbdd
£¨1£©°×»¨£¨AABBDD£©¡Á»Æ»¨£¨aaBBDD£©£¬F1»ùÒòÐÍÊÇAaBBDD£¬F1²â½»ºó´úµÄ»¨É«±íÏÖÐͼ°Æä±ÈÀýÊÇÈé°×»¨£º»Æ»¨=1£º1£®
£¨2£©»Æ»¨£¨aaBBDD£©¡Á½ð»Æ»¨£¬F1×Ô½»£¬F2Öлƻ¨ÖеĴ¿ºÏ¸öÌåËùÕ¼±ÈÀýÊÇ$\frac{1}{5}$£®
£¨3£©¸ÊÀ¶ÐÍÓͲ˻¨É«ÓйÛÉͼÛÖµ£¬Óûͬʱ»ñµÃËÄÖÖ»¨É«±íÏÖÐ͵Ä×ÓÒ»´ú£¬¿ÉÑ¡Ôñ»ùÒòÐÍΪAaBbDdµÄ¸öÌå×Ô½»£¬ÀíÂÛÉÏ×ÓÒ»´ú±ÈÀý×î¸ßµÄ»¨É«±íÏÖÐÍÊÇÈé°×»¨£®

·ÖÎö ¸ù¾ÝÌâÒâºÍ±í¸ñ·ÖÎö£¬¸ÊÀ¶ÐÍÓͲ˻¨É«ÐÔ×´ÓÉÈý¶ÔµÈλ»ùÒò¿ØÖÆ£¬×ñÑ­»ùÒòµÄ×ÔÓÉ×éºÏ¶¨ÂÉ£®°×»¨µÄ»ùÒòÐÍΪAA----£¬Èé°×»¨µÄ»ùÒòÐÍΪAa----£¬»Æ»¨µÄ»ùÒòÐÍΪaaB---»òÕßaa--D-£¬½ð»Æ»¨µÄ»ùÒòÐÍΪaabbdd£®

½â´ð ½â£º£¨1£©Èð׻¨£¨AABBDD£©Óë»Æ»¨£¨aaBBDD£©ÔÓ½»£¬ºó´ú»ùÒòÐÍΪAaBBDD£¬±íÏÖÐÍΪÈé°×»¨£¬Æä²â½»ºó´úµÄ»ùÒòÐͼ°±ÈÀýΪAaBbDd£ºaaBbDd=1£º1£¬ËùÒÔF1²â½»ºó´úµÄ»¨É«±íÏÖÐͼ°Æä±ÈÀýÊÇÈé°×»¨£º»Æ»¨=1£º1£®
£¨2£©»Æ»¨£¨aaBBDD£©¡Á½ð»Æ»¨£¨aabbdd£©£¬F1»ùÒòÐÍΪaaBbDd£¬2¶Ô»ùÒòÊÇÔӺϵģ¬aaBbDd×Ô½»ºó´úF2µÄ»ùÒòÐÍÓÐ3¡Á3=9ÖÖ£¬±íÏÖÐÍÊǻƻ¨£¨9aaB-D-¡¢3aaB-dd¡¢3aabbD-£©ºÍ½ð»Æ»¨£¨1aabbdd£©£¬¹ÊF2Öлƻ¨µÄ»ùÒòÐÍÓÐ8ÖÖ£¬ÆäÖд¿ºÏ¸öÌåÕ¼»Æ»¨µÄ±ÈÀýÊÇ3¡Â15=$\frac{1}{5}$£®
£¨3£©Óûͬʱ»ñµÃËÄÖÖ»¨É«±íÏÖÐ͵Ä×ÓÒ»´ú£¬ÔòÇ×´úÐèͬʱº¬ÓÐAºÍa¡¢BºÍb¡¢DºÍd£¬¹Ê¿ÉÒÔÑ¡Ôñ»ùÒòÐÍÊÇAaBbDdµÄ¸öÌå×Ô½»£¬×Ó´ú°×»¨µÄ±ÈÀýÊÇ$\frac{1}{4}$£¬Èé°×»¨µÄ±ÈÀýÊÇ$\frac{1}{2}$£¬»Æ»¨µÄ±ÈÀýÊÇ$\frac{1}{4}$¡Á$\frac{3}{4}$¡Á$\frac{3}{4}$+$\frac{1}{4}$¡Á$\frac{3}{4}$¡Á$\frac{1}{4}$+$\frac{1}{4}$¡Á$\frac{1}{4}$¡Á$\frac{3}{4}$=$\frac{15}{64}$£¬½ð»Æ»¨µÄ±ÈÀýÊÇ$\frac{1}{4}$¡Á$\frac{1}{4}$¡Á$\frac{1}{4}$=$\frac{1}{64}$£¬ËùÒÔÀíÂÛÉÏ×ÓÒ»´ú±ÈÀý×î¸ßµÄ»¨É«±íÏÖÐÍÊÇÈé°×»¨£®
¹Ê´ð°¸Îª£º
£¨1£©AaBBDD     Èé°×»¨£º»Æ»¨=1£º1
£¨2£©$\frac{1}{5}$
£¨3£©AaBbDd      Èé°×»¨

µãÆÀ ´ËÌâÓÐÒ»¶¨µÄÄѶȣ¬ÖصãÀí½âÈý¶ÔµÈλ»ùÒòλÓÚÒ»¶ÔͬԴȾɫÌåÉϺÍÈý¶ÔµÈλ»ùÒòλÓÚÈý¶ÔͬԴȾɫÌåÉ϶ø³öÏֵIJ»Í¬½á¹û£®

Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿

Î¥·¨ºÍ²»Á¼ÐÅÏ¢¾Ù±¨µç»°£º027-86699610 ¾Ù±¨ÓÊÏ䣺58377363@163.com

¾«Ó¢¼Ò½ÌÍø