第三次用天平，取２，３放上天平，如果相等，是８号球，如果不等，可判断该小球轻于其他球. Again, you don't know if that ball is lighter or heyier than others, still need one extra step.

guest:

(#48317@0)
Last Updated: 2001-4-18
This post has been archived. It cannot be replied.

Report