·µ»Ø
°Ù·Ö°Ù·ÀÊØ£¬ËùÓнÌÁ·¶¼ÏëÇ©ÎÒ
Ê×Ò³
¹ØµÆ
»¤ÑÛ
×ÖÌ壺
´ó
ÖÐ
С
Çë¼ÙÌõ(1/2)
´æÊéÇ©
Êé¼Ü¹ÜÀí
·µ»ØÄ¿Â¼
º¼Öݳö²î½áÊø¸Õµ½¼Ò£¬³¢ÊÔ³å´ÌдһÏ·¢ÏÖʱ¼äʵÔÚ²»¹»ÁË£¬Ïò¸÷λ¾ÃµÈµÄ¶Ê±§Ç¸£¡
Ã÷Ìì4/27±¬¸ü²¹³¥£¡
Çë¼ÙÌõ(1/2),µã»÷ÏÂÒ»Ò³¼ÌÐøÔĶÁ
ÉÏÒ»ÕÂ
Ŀ¼
ÏÂÒ»Ò³