It can be said that most of the contents in the book are not taken in the postgraduate entrance examination for mathematics, no matter how much mathematics there is, it cannot be generalized. Of course, the outline is king. 09- 1 1 The three-year mathematical outline has not changed a word, but the outline is abstract, so it is feasible to judge whether a chapter or even a section is beyond the outline. To judge whether a knowledge point is under class, it is best to judge it with a tutorial.