put 3 balls on each side, . ?. m" T4 ~$ A
if balance, we can prove that all 6 balls on the 天平 is normal, $ e& e8 ~3 b7 t/ K# U
if not balance, we can prove that the 6 balls outside the 天平 is normal.
' A2 o e( |3 S+ v7 R# htvb now,tvbnow,bttvbthen use the proved-normal ball on one side and put the other ball on other side 4 V/ Q) `& l2 C9 r
to determine the abnormal is heavy and light |
發表於 2011-5-11 04:50 AM
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