Depends on what you think. The repeat book is mainly a summary of knowledge points, and lists some questions (mostly conceptual questions) that need to be answered. Then I chose examples and exercises after class. It's easier to get to the point Personally, this book is a little stingy for the advanced Tongji editions of the two books, but it can play an outline role. The following is a complete solution, which is the solution of the exercise. There is no summary of knowledge points, but there will be detailed explanations or expansion under some important reminders, which is very bloody! In a word, I personally think that the complete solution is very beneficial to improve the overall ability and grasp the spirit of the whole higher mathematics system. Attached to the book, I feel that it is better to read it with a little skill, and there is no nutrition.