Learning method:

If you want to learn math well in the future, you must preview first, then do the problems, and then listen to the class. ...

Your problem now is that you didn't preview before class, didn't understand it in class, didn't do the questions after class, and didn't think of learning until the exam. ...

This is very difficult. ...

I can't understand the example because you don't even know what the derivative formula of derivative function is. ...

I suggest you don't read textbooks, let alone textbooks. Just take the training materials in the classroom and do it. If you don't understand the answer, you can ask the teacher or ask the questions here. You can also Baidu hello me. ...

First, because the current textbooks, especially high school textbooks, are not guided by teachers, students will basically be confused when they read them, and they will feel that they understand them after reading them, and they will be finished after reading them, feeling that they have learned nothing. ...

Second, because the textbook has complete answers, the whole is the explanation of the answers in the textbook, which is ok for teachers and basically bring disgrace to oneself for students. ...