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)
Last Updated: 2001-4-18
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