put 3 balls on each side, * X' j X7 k: M/ _: S \
if balance, we can prove that all 6 balls on the 天平 is normal, 2 d5 E# o" j+ f" @# Q
if not balance, we can prove that the 6 balls outside the 天平 is normal.
4 v- X& v! t% \$ X% V, Qthen use the proved-normal ball on one side and put the other ball on other side
5 z2 ^, W+ }% g$ }' X5 M) q公仔箱論壇to determine the abnormal is heavy and light |
發表於 2011-5-11 04:50 AM
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