As the saying goes: "Learn mathematics and physics well, and you are not afraid to travel all over the world." At present, the last question of physical chemistry in senior high school entrance examination is generally related to mathematics. Although it is not too difficult, you should also know the importance of the interconnection of these three disciplines in the circle. If one subject is not well studied, it may affect the other two subjects. Although my math is not the first in our class, my three subjects add up to more than others. So the exam pays attention to mathematics.