推荐回答(5个)
至少需要6次,300的3等份是100。5,30,35这3个数进行组合,只有35*2+30是最优组合,需要3次,剩下的200再做一次同样的分法,就是6次了。这是我目前想到的最少的分法。
6次
第一次 不用砝码 分成2份150的
第二次 不用砝码 把其中1份150的分成2份75的
第三,四次 用30的砝码 把150的取出2份30的分别加到75里面 现在是90 105 105
第五,六次 用5的砝码 把2份105的都取出5克放到90那份 现在就是100 100 100 三等份了
4次
1.用30和5的砝码一起称
2.同1
3.用30的砝码称一次
4.1.2.和3.一共有100克盐了 用100克盐放一边 从剩下的200克盐里拿100克盐放另一边 天平平衡
好了 100 100 剩下的100 三等份了
给分吧
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