·µ»Ø

¶þÊÀÏÉ·²µÀ

Ê×Ò³
¹ØµÆ
»¤ÑÛ
×ÖÌ壺
´ó
ÖÐ
С
Çë¸ö¼Ù(1/2)
   ´æÊéÇ© Êé¼Ü¹ÜÀí ·µ»ØÄ¿Â¼
½ñÌìÍíÉÏÓÐÊ£¬Ã»Ê±¼äдÁË£¬Ò²Ã»´æ¸å£¬??

      ¡¶¶þÊÀÏÉ·²µÀ¡·Çë¸ö¼Ù ÕýÔÚÊÖ´òÖУ¬ÇëÉÔµÈÆ¬¿Ì£¬
Çë¸ö¼Ù(1/2),µã»÷ÏÂÒ»Ò³¼ÌÐøÔĶÁ
ÉÏÒ»Õ Ŀ¼ ÏÂÒ»Ò³