这个传入的参数值会嵌套在另一个字符串中，以获得已计算出的和返回的公式的结果。
我学到的是已经被数学推理和实际经验所证明的公式。
这些就是计算要用到的所有的变量，把它们代入第二节课,讲过的公式中去。
我们在平时学习和工作中，要学会灵活运用公式，不能生搬硬套。

人生没有固定的格式，也没有永恒的公式。

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