put 3 balls on each side, os.tvboxnow.com9 \! ~) s4 h: {7 V6 Q, E" X
if balance, we can prove that all 6 balls on the 天平 is normal, & B: l0 N7 ?* n9 s: o o7 W1 u( m6 M
if not balance, we can prove that the 6 balls outside the 天平 is normal.6 T5 L. j! R9 P3 e
then use the proved-normal ball on one side and put the other ball on other side
' d6 y" V; [, m4 I& s) `* s$ _! P v* Zto determine the abnormal is heavy and light |
發表於 2011-5-11 04:50 AM
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