The question is comprehensive and the explanation is detailed. The "26 core questions of mathematics in the senior high school entrance examination" was developed by Zhejiang University, which included the classification and screening of real questions in the country in the past five years, and all the 26 questions that must be taken in the senior high school entrance examination were summarized and explained in great detail. Comprehensive selection of real questions as examples and exercises can teach students to solve problems step by step.