Generally speaking, students who hate mathematics will find it difficult when they see mathematical formulas or words; The main reason is that they have not fully understood the laws of mathematics and immediately wasted all their energy on extremely difficult mathematical problems. In fact, no matter what complex problems we face, as long as we can persistently seek answers, we will eventually find hidden laws. Therefore, before entering junior high school and formally taking the first step towards mathematics, I hope readers can clearly understand the basic concepts and laws of mathematics.