Preface to the math correction book: don't be too absolute if you don't copy all the questions. Some questions may not be understood from beginning to end, or most of them are not understood. In order to ensure the continuity of the problem, copy it all.

Not all of them. Many students like to copy the title completely from beginning to end when writing a book to correct mistakes, or some people like to cut it out and paste it in a notebook. There is only one book for the postgraduate entrance examination, and I have to read it again and again. The method of cutting books won't work. Copying down all the questions can really let you know what the questions are when you look back, but both questions can be used, and the ideas of the postgraduate entrance examination questions are relatively novel. Maybe you will encounter many problems that you can't do. Copy all? Five or six hours a day may be spent copying questions, which is too low in cost performance. And you wrote a thick one, two? Do you want to watch it again? I may have given up before I started.

Then we need to adopt a more efficient way to extract parts. When you solve a problem, you will find that not all the problems you can't do are impossible to do, but a small part of them, such as an unchangeable expression transformation, an unchangeable formula, an unchangeable simplification and an idea you haven't seen before. That is to say, this is the part that prevents you from doing this problem. Isn't the purpose of doing the problem to find out the part you can't do? So, you just need to extract this part. As for the other parts I have already learned, I personally don't think it is necessary to spend some time writing them. Every question uses the principle of 1+ 1=2. It is useless to write 100 times.

Error-corrected edition is also called wrong edition, wrong edition, wrong edition and wrong set. Using error correction is an important means to improve learning efficiency, improve learning quality, consolidate learning foundation and achieve excellent results. It's not as good as sorting out the wrong book for the first place in the college entrance examination, because correcting the wrong book belongs to one's own personalized review materials, which is a collation of knowledge, a collection of key points, especially difficulties and refining points, and a key analysis based on systematic learning, which makes the learning focus more prominent, the review more targeted and the learning efficiency higher.