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图中画的是9枚外形一样的硬币,其中8枚硬币的重量相等,只有1枚硬币的重量稍微轻一点。如果给你一台没有砝码的天平,请问:最少需要
The picture shows nine identical coins, of which eight coins are of equal weight and only one coin is slightly lighter. If you give a balance without a weight, please ask: at least