In the seventh grade, if you want to solve some application problems in the first volume of Mathematics Corner, you must first understand some related formulas of ruler, and then you can solve the problem smoothly. Because the first sub-question of the application problem is generally a category that can be solved directly by formula, and then if you can remember the formula, you can directly get the score of the first sub-question.

Then in the second or third sub-question, you need to have your own specific analysis process, that is, combine some other mathematical knowledge, and then solve this application problem. Then in the second or third sub-question, it is necessary to analyze it in detail, and then remember other knowledge points in order to solve this problem smoothly.

Therefore, if you want to solve this kind of application problems, you need to remember the formula first, and then accumulate all kinds of experience and other knowledge points, in order to make this kind of problems perfect.