Don't be arrogant: mathematics is a knowledge of integrating theory with practice. Familiarity and understanding of basic theoretical concepts is only the premise of learning mathematics well, and the ultimate goal is to apply it to practical operation or our daily life. Therefore, we should be diligent in doing problems and resolutely avoid the learning attitude of condescending. "Practice is the only criterion for testing truth", and mathematics is no exception!
Four ways of thinking: four thinking systems of mathematical system: combination of numbers and shapes, function thought, classified discussion and equation thought. In the process of learning mathematics, we should organically combine the known quantity with the unknown quantity, and express the known numerical value in the form of functions and equations. In the case of unknown undetermined, it is necessary to analyze the specific situation and analyze the answers to different situations!