put 3 balls on each side, tvb now,tvbnow,bttvb B( S: \& l6 o) b2 i; K/ U; f
if balance, we can prove that all 6 balls on the 天平 is normal, / V/ W r" b& }& K$ n$ [1 d
if not balance, we can prove that the 6 balls outside the 天平 is normal.
. W: J4 M; @: |6 t6 D' b1 C* X: J( _0 Lthen use the proved-normal ball on one side and put the other ball on other side 6 J) q) j$ a" S
to determine the abnormal is heavy and light |
發表於 2011-5-11 04:50 AM
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