The most difficult thing is the similarity between inverse proportional function and graph.

In fact, a person learning a unit is not afraid of anything, nor will it be difficult, and he is afraid of being completely dead.

There is also a question with the trend of senior high school entrance examination, that is to say, giving you a brand-new definition and answering questions according to the definition given by it is usually annoying to ask the last question.

There is also the combination of classified discussion questions and moving questions with the above knowledge.