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五年级数学比与比列 Youtube 截个维基百科：Charles Fefferman A child prodigy, Fefferman entered college by the age of 11 and had written his first scientific paper by the age of 15 in GermanHe received his BS from University of Maryland in mathematics, which is part of the University of Maryland College of Computer, Mathematical, and Natural Sciences at age 17 Then, he received his PhD in mathematics at比（ひ、英 ratio ）とは2つ（または3つ以上）の数の関係を表したもの。 数 a, b について、その比は ab で表され、「a対b」とよむ。a を前項、b を後項（こうこう）という。また、前項と後項を入れ替えた ba を元の比の逆比または反比という。3数以上の場合も abc のように表し、特に連比 比 数学