Just as in grade school when you're doing division and multiplication, you do it from left to right in terms of order of operations.

正像是在小学你做除法和乘法的时候,你毫不含糊地从左到右,按顺序做运算。

哈佛公开课 - 计算机科学课程节选

STUDENT: Standard order of operations, I guess take the multiplication first, and add the three.

学生：标准运算符的顺序，我猜是先做乘法，然后再去加3。

麻省理工公开课 - 计算机科学及编程导论课程节选