Intention: Let people who study this book feel that there is mathematics everywhere in their lives; Let yourself feel smarter and more capable, and many problems that you couldn't solve before and things that you can't do can be done now!

Overall conception: There will be hints and pictures in the book to help students understand what they want to learn. Let the students think, try and discuss, then read the textbook and listen to the teacher. After that, they will enrich their knowledge through in-class exercises, knowledge and skills, mathematical understanding, problem solving and other exercises, so as to better understand and master the content of this lesson!