Then learn slowly from the basics and spend more time understanding. When I first entered high school, many people generally felt that it was much more difficult than before, and there were many subjects, so it took some time to get used to it. This is a very common and normal phenomenon. Since I like science, I am interested. Interest is a good motivation. Calm down and try to understand from the definition of function. When understanding the definition of function, we should start with some simple functions to deepen our understanding, and then cooperate with some simple questions to consolidate our understanding. Slowly, you will find it easy to understand and get started.
Complex functions are actually functions, so the essence is the same. It can be understood as a combination of several simple functions plus some operational relationships, so don't be afraid first, try to break them down into several simple functions and then deal with them separately. Of course, be careful, organized and logical.
Definition of function: Given a number set A, apply the corresponding rule F to A, and record it as f(A) to get another number set B, that is, B=f(A). Then this relationship is called functional relationship, or function for short.
The concept of function includes three elements: definition field A, value field C and corresponding rule F, among which the core is corresponding rule F, which is the essential feature of function relationship.
The definition of function is not difficult to understand, so we should grasp the three elements of function: definition domain, value domain and corresponding law. For functions that can be expressed by equations, we should pay special attention to its domain, and we can be familiar with its domain by combining images. For example, the denominator of a fraction cannot be 0, the base of an open square root must be greater than 0, and the base of a logarithmic function cannot be 0. And we should pay attention to the various limitations of the topic.
Step by step, combined with images, we have a general understanding of various basic functions (linear function, quadratic function, cubic function, power function, exponential function, logarithmic function, trigonometric function, etc.). ), and then remember their definitions and value domains, unfamiliar functions, such as logarithmic functions, and draw more pictures and do more problems to help you understand. Grasp the characteristics of basic type functions, and the complicated ones will be easy to handle. Ask teachers and classmates more if you don't understand, use your brains and do more. I wish you progress in your study.