小圆面积是大圆一半,半径是2^.5/2=.7071...

来源: jinjing 于 2011-11-21 18:27:08 [旧帖] [给我悄悄话] 本文已被阅读：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.