All right. With the deepening of curriculum reform, different people are allowed to learn different compulsory knowledge of high school mathematics, and elective learning has become the general trend in the world today. Standing at the height of knowledge expansion, guided by advanced teaching ideas, this book combs the core knowledge of high school mathematics, expands the classic content of mathematics, and strives to make the problem-solving methods representative, so that the content is novel, the solution is simple, the analysis is in place, and it can play the role of making the finishing point. The depth of knowledge is not higher than the level of independent enrollment, but close to the level of national league trials, aiming at improving the mathematical literacy of students who intend to develop into science and engineering in the future.