At first, I was good at math. Senior one was dumbfounded when he saw math. Kneel for a mathematical genius to talk about the essence of abstract resolution function and learn high school mathematics.
Abstract analytic function is actually to regard abstraction as a unit or simply imagine it as a pure number, which is relatively simple. Do more questions in the future and you will get used to it. Practice makes perfect. Examination-oriented education only knows how to use some routines to expand one's thinking. It is not very broad.