put 3 balls on each side,
7 n: \ B& E& j+ T- w0 p! TTVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。if balance, we can prove that all 6 balls on the 天平 is normal, tvb now,tvbnow,bttvb# H" A% i8 Y; |# M( i, A7 E9 B
if not balance, we can prove that the 6 balls outside the 天平 is normal.TVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。! I$ ?4 Y' _( ?8 L
then use the proved-normal ball on one side and put the other ball on other side 5.39.217.77:8898$ F3 C7 q. ?/ Y- N
to determine the abnormal is heavy and light |