Any questions about going through these cycles and using expressions like this and so forth? Expressions like this you know turn up in various places, like in the equations sheet that appears at the end of exams, right?
关于推导这些循环和使用,这样的表达式之类的,有没有什么问题?,这样的表达式在各种地方都会出现,比如试卷后面的公式页?
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