put 3 balls on each side, 5.39.217.77:8898' A2 O, m0 z, f( V7 z( z" h
if balance, we can prove that all 6 balls on the 天平 is normal, 2 \. a( B2 [9 g
if not balance, we can prove that the 6 balls outside the 天平 is normal./ D0 D" p8 x. x: l, q
then use the proved-normal ball on one side and put the other ball on other side 公仔箱論壇# q/ C3 [3 S+ G# ?. }8 t% {) _
to determine the abnormal is heavy and light |
發表於 2011-5-11 04:50 AM
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