Every subject has its own learning rules. Mathematics focuses on computational logic thinking, while chemistry and physics have different scientific knowledge in each chapter. We should have the ability of scientific imagination to understand physical and chemical phenomena, enrich scientific imagination, learn the knowledge of each chapter in combination with our own characteristics, and then combine the geometry, trigonometry and solid geometry learned in junior and senior high schools and apply them comprehensively. Never divide them! Only in this way can we learn well!