Judging from the handling method in your district, it is likely to be invalid. We made a mistake in naming this time and asked the instructor. I can only say that we should pay more attention to these aspects in the future, and have a long snack.

Mathematical modeling is to establish a mathematical model according to actual problems, solve the mathematical model, and then solve the actual problems according to the results.

When it is necessary to analyze and study a practical problem from a quantitative point of view, people should use mathematical symbols and language to establish a mathematical model on the basis of in-depth investigation, understanding of object information, making simplified assumptions and analyzing internal laws.