1, Zhang Yu 1000, exercise questions and answers are divided into volumes, which is convenient to carry, but the exercise questions are printed too tightly, especially the answers are basically not written, which is inhuman. This is a matter of typesetting. Some people say that the content is patchy. I hope everyone can discuss this.

2. Tang 1800 is very thick, and the answers and exercises are typeset in a book every once in a while. It is difficult to win the championship, and the foundation and high scores are good.

3, 660 questions have been popular since more than a decade ago, but they have not been updated with the changes in postgraduate mathematics. They belong to antique problem sets, and many people with inheritance feelings like to use them. It is a set of questions about the difficulty and deviation of postgraduate entrance examination. Of course, if you can finish it, it's better than not, but here are the characteristics of the basic problem set, so these 660 problems will soon sneak into history like the glory of Chen Wendeng's book.