Mathematics is the first of all sciences, and all sciences are based on mathematical knowledge, so some teachers say that mathematics is difficult; However, mathematics needs thinking ability and reaction ability. You can recite other subjects, but not math. Mathematics needs to accumulate knowledge for a long time and be skillfully used on the spot. Someone once said, "I can review politics and history in a week, but I can't do math." Need ordinary accumulation. " People with poor thinking ability dare not do geometry problems, while people with strong thinking ability like to do geometry problems. Because geometry problems need to use all the knowledge flexibly, people who like to do geometry problems must have good mathematical knowledge, but their grades are not necessarily good. (Performance depends on field performance)