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1. I suggest you study Engineering Mathematics: Complex Variable Function first, which is a green textbook taught by Lu in higher education. Reason: The contents of the previous chapters of mathematical methods are all complex variable functions, but I have read many books on mathematical methods, and the contents of complex variable functions are not very good and not easy to understand. And the textbook I just said is very clear. That's what I saw at the time. It covers all the knowledge points in mathematical methods, and complex variable function is the basis behind it.
As for the textbook of mathematical methods, Wu, Wu and Wu are all good.
3. When learning mathematical methods, you can read more different textbooks or reference books.
150 What courses are there in Montessori?
There are more than 100 hours of Montessori system courses, including psychosensory actions (0-3), language (0-6), senses (3-6),