This book has five characteristics. First, mastering knowledge, skills and knowledge is an important foundation for mathematics learning. Second, cultivate thinking ability, which is an essential quality in mathematics learning. Third, strengthen the sense of application, which closely links mathematics with life. Fourth, cultivate innovative consciousness, innovative consciousness, so that mathematics and creation have a voice. The last feature is to master the learning method, and the scientific method is the master key of mathematics learning. Choose supplementary books published by regular education publishing houses or other big regular publishing houses. Most of these publishing houses can organize specialized personnel or senior teachers and experts to compile supplementary books, so as to keep pace with the current teaching materials, and the quality of supplementary books can usually be guaranteed.