回复：关于:13个球秤3次,找出异常球并指出轻重!?

You are great.If you can do this by heart and not old,you could become a math prof. I like do questions by heart,so, a lot of mistakes,I'm sorry.Good luck.

所有跟帖： 

• by heart -badminton- ♂ (1794 bytes) () 05/04/2010 postreply 11:06:38

• From If(2), b12&b13, you didn't tell the ball is ligher or heav -twfx- ♂ (28 bytes) () 05/04/2010 postreply 15:53:01

• Be careful. -jinjing- ♀ (82 bytes) () 05/04/2010 postreply 16:07:56