put 3 balls on each side, 4 d+ h( S2 _7 c, J+ p
if balance, we can prove that all 6 balls on the 天平 is normal,
* Q' c9 w( }4 q/ vwww3.tvboxnow.comif not balance, we can prove that the 6 balls outside the 天平 is normal.
) y6 m0 j: W0 I! `& U% kwww3.tvboxnow.comthen use the proved-normal ball on one side and put the other ball on other side - u" J" ~& O( T3 B7 t+ m
to determine the abnormal is heavy and light |