Logarithmic scale (Figure 1):

Logarithmic scale (Figure 2):

This function is very important for the whole high school, especially for senior high school students, and it is very important to get started. Why do you say that?

The math score of the college entrance examination is 150, and the function score is as high as 45. After grade one, you will learn exponential function, power function, positive and negative proportional function, trigonometric function, logarithmic function and so on. There are many problems and complex function images. Many students just can't draw function diagrams at the beginning, and many sections can't analyze at all, which leads to the subsequent study of other sections, and so on. Math scores plummeted.