Newton also worked out a mathematical expression for gravity.

牛顿也为地心引力完成了一种数学公式。

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Newton began to search for a mathematical expression of his idea.

牛顿开始探索用数学来表达他的观念。

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By equation we mean a mathematical expression in which the two sides balance.

所谓方程式，是指两边相等的数学式。

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The answer was, find a mathematical expression depending on the number of inputs.

很不错，答案是，找到一个通过输入数字,计算出来的数字表达式。

麻省理工公开课 - 计算机科学及编程导论课程节选