·µ»Ø

Öïа

Ê×Ò³
¹ØµÆ
»¤ÑÛ
×ÖÌ壺
´ó
ÖÐ
С
Çë¼ÙÒ»Ìì ½ñÌìÍ»·¢×´¿ö£¬Óм±Ê£¬Çë¼ÙÒ»Ì죬¸÷λº£º­(1/2)
   ´æÊéÇ© Êé¼Ü¹ÜÀí ·µ»ØÄ¿Â¼

Çë¼ÙÒ»Ìì ½ñÌìÍ»·¢×´¿ö£¬Óм±Ê£¬Çë¼ÙÒ»Ì죬¸÷λº£º­(1/2),µã»÷ÏÂÒ»Ò³¼ÌÐøÔĶÁ
ÉÏÒ»Õ Ŀ¼ ÏÂÒ»Ò³