put 3 balls on each side, " H" a/ s! x3 c4 E
if balance, we can prove that all 6 balls on the 天平 is normal,
( R$ E/ q4 y% l" r7 B" P' V+ U( Bif not balance, we can prove that the 6 balls outside the 天平 is normal.
8 t( R' ~) r# u2 P; M- y x! g5 ltvb now,tvbnow,bttvbthen use the proved-normal ball on one side and put the other ball on other side
I9 T( d ]# g, b- U5.39.217.77to determine the abnormal is heavy and light |