I didn't study math for three years in junior high school. I want to make up lessons. I don't know where the connection point between junior high school and high school is. Can you finish learning junior high school functions in half a month? See what kind of person you belong to. When I didn't learn function in junior high school, I heard my classmates say that function is the most difficult in mathematics, but after my education, I think it is very simple, and I can't guarantee that I can do it well 100%. Generally no problem. But for some people, functions are difficult to learn. The function of junior high school is ok, not as complicated as that of senior high school, mainly quadratic function, and the most difficult thing is the combination of quadratic function and linear function. As far as I know, I didn't learn logarithmic function in junior high school, and I mentioned exponential function, but I didn't talk about it in depth.

If you have a good understanding, it is still possible to learn functions well in a short time.

For the function, we must first understand its properties, images and so on, so as to use it flexibly. Did you graduate from junior high school? When you were in high school, you had a cohesion course. You have to learn junior high school knowledge and senior high school knowledge, but it is easier than senior high school and more difficult than junior high school.

First, the difference between cube and cube

Second, the application of Vieta's theorem.

Third, cross multiplication in factorization.

Fourthly, the discrimination of the roots of the unary quadratic equation is the maximum of the image properties.

Fifth, the expression of the function is the general formula of point inclination and two points and so on.

But for you who didn't listen to the class in junior high school and didn't understand, work hard. If you don't understand anything about this, just ask me. If you don't understand, please ask questions and hope to adopt them.