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为什么半径用r表示
更新时间: 2020-09-19 00:00:00  

半径是由国外的数学家提出来的,为了方便表示,方便在计算公式中的运用,便以单词的第一个字母来表示,radius为半径的英文,所以首字母r表示半径。

关键词: 为什么 半径 表示

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