所跟帖: ÊÀ½ç´óͬ±¨ : ѧ½çÌ©¶·ÕÔ×Ü¿í²©µ¼Ñ§ÊõÁ¦Í¦ÁõºÆ·æÈËÀà×îÓÅÕþÖεÄÊýÀíÂß¼Ö¤Ã÷ 2011-05-21 05:38:41
ÔÛÏȲ»¼±×ÅЦ°Á½ºþ£¬ÎÊÄã¸öÎÊÌ⣺¦Â = 6.283, cos(¦Â) = ?