Multiplication and division have higher precedence than addition. Their operands are bound to the operator in preference to the operands to addition.

乘法和除法的优先级高于加法操作，于是它们的操作数先于加法操作的操作数计算。

youdao

So hopefully there is indeed a way to fix this, but it looks as though the division operator, the single slash is division but -- and here's a curiosity about many programming languages -- because 17 is an integer and because 13 is an integer, why do I say that?

我的确希望有一个方法来修正这个错误，但是看起来,好像那个除法操作，那个斜杠是除法,但是--对于很多编程语言来说,是挺奇怪的--因为17是一个整数,13也是一个整数，为什么我这样说？

哈佛公开课 - 计算机科学课程节选

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