660 and Zhang Yu 1000 are both very popular exercises in the math review for the postgraduate entrance examination. They have their own advantages and disadvantages and are suitable for different groups of candidates. I will compare these two books from the following aspects to help you better understand their advantages and disadvantages, so as to choose a problem set that is more suitable for you.

1, difficulty: 660 questions are relatively low in difficulty and suitable for candidates with weak foundation. The knowledge involved in the topic is relatively basic, but there are also some difficult topics, but overall the difficulty is moderate. Zhang Yu 1000 is relatively difficult and suitable for candidates with good mathematical foundation. The topic involves a wide range of knowledge points and many difficult topics, which may be difficult for candidates with poor mathematical foundation.

2. Question type: 660 questions are mainly multiple-choice questions and fill-in-the-blank questions. These questions mainly examine the basic knowledge and computing ability of candidates. Zhang Yu 1000 questions are mainly big questions, which mainly examine candidates' comprehensive application ability and problem-solving skills. Therefore, if you want to do well in the math exam, Zhang Yu's question 1000 may be more suitable for you.

3. Coverage of knowledge points: 660 questions cover all the knowledge points of postgraduate mathematics, but the questions are relatively simple, and the investigation of some key knowledge points may not be deep enough. Zhang Yu 1000 questions pay more attention to the in-depth excavation of key knowledge points, so some difficult questions will be set for some key knowledge points.

4, answer analysis: the answer analysis of 660 questions is more detailed, and each option has an explanation, which is easier for candidates to understand. The answers to Zhang Yu 1000 questions are also detailed, but some questions may involve some advanced problem-solving skills, which may be difficult for candidates to understand.

To sum up, Question 660 and Question Zhang Yu 1000 have their own advantages and disadvantages. Which one to choose depends on your personal situation and needs. If you have a poor foundation in mathematics and want to improve your grades in a short time, then 660 questions may be more suitable for you; If you have a good foundation in mathematics and want to do well in the math exam, then Zhang Yu's 1000 question may be more suitable for you.