Learning begins with thinking, and thinking begins with doubt. How many reasons should we ask about the content of preview? From the introduction of method to the connotation and extension of concept, from the method of evidence problem to the basis of evidence problem. Thinking in Preview: What are the emphases and difficulties of this section? What are the meanings of concepts, theorems and formulas? What are the conditions? There are many formulas in the math textbook. Students should temporarily put down their textbooks and think about how to deduce and compare, or compare with the teacher's reasoning process in class, and whether there is a derivation process. You can find out if there is something wrong with you. Textbook, try it first, compare it with the answers in the textbook, and think about whether there are other solutions or simpler methods (solving problems) to this problem.

Analyze and solve problems independently and check learning. Generally speaking, formulas or mistakes cannot be inferred, and examples cannot be wrong or wrong. Because of insufficient knowledge preparation, I forgot what I learned, or I haven't learned some content yet. As long as I make up, I can make progress. In short, you should think more and learn to ask questions when previewing.

Comparative reading is to find out the similarities, similarities and differences with related knowledge and bring them into the corresponding knowledge chain. If students are studying arithmetic progression's definition, navigation formula, the first few summation formulas, etc. You can find out if you have any problems. Textbook, try it first, compare it with the answers in the textbook, and think about whether there are other solutions or simpler methods to this problem, so that you can learn by classification when you preview arithmetic progression's content. As can be seen from the definition of two columns, the difference between an arithmetic column and an arithmetic column is that the difference (sum) can be converted into a ratio (product), and the two columns can be compared in the form of a table. Familiar with the characteristics of the two series in comparison, strengthen structural memory.

You can find out if there is something wrong with you. For the textbook, try it first and compare it with the answers in the textbook to see if there are other solutions or simpler methods to this problem.