Algebra and Linear algebra (i. e. matrices). They should teach Linear algebra immediately after algebra. It's pretty easy and it's amazingly useful in all sorts of domains including machine learning.
代数和线性代数(比如：矩阵)，他们会在教完代数后立即教线性代数。这也简单，但这在相当多的领域非常有用，包括机器学习。
If something comes up again and again (like algebra and linear algebra), then I'll start doing some exercises to make sure I really understand it.
如果某些问题(比如代数和线性代数)一次又一次的出现，我就做些练习去确认我是否真正的理解它了。
I have been teaching courses such as Calculus, Linear Algebra, and Probability and Mathematical Statistics in the institute for more than twenty years.
所学专业是应用数学，主要教授《微积分》、《线性代数》、《概率论与数理统计》课程。
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