Because the mathematics textbooks compiled by Tongji University are generally considered to be the best, freshmen get started quickly, and the examples in them are very representative, and the mathematics department of Tongji University is very good, almost all people who buy advanced mathematics textbooks only agree with the economic edition.

In the face of the problem that you can't do for the first time, you should look at the answer carefully, understand his thinking carefully, and learn to draw inferences from others; If you encounter similar problems in the future, you should be impressed and familiar with them. Even if you forget the specific process of the answer, remember where you read it.

Advanced math skills:

Doing exercises itself is to test your ability to use basic knowledge flexibly. I know that some people's motivation for doing problems is mainly to get a sense of accomplishment, and they will be very depressed when they face problems that they can't do. They simply looked at the answer, and then they couldn't remember it. This attitude is not a good attitude to learn mathematics.