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一根电线用去1/4还剩3/4米对吗
更新时间: 2021-03-13 07:18:46  

1、比如一根电线长1米,用去1/4,即用去1*1/4=1/4米,还剩下1-1/4=3/4米 ,即1*3/4=3/4米。

2、以此类推,假设一根电线长n米,用去1/4,即用去n*1/4=n/4米,还剩下n-n/4=3n/4米,即n的3/4,3n/4米。因此,这种说法是对的。

关键词: 电线

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