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我觉得可以呀, 因为这种情况下,第二次使用天平时已知该小球是轻还是重了,所以第三次只要从1,2,3中任取两个称称即知, (另,我不太明白你的意思)

tutu (lazy tutu)
(#48499@0)
2001-4-18 -04:00
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