In foreign mathematics education, it is usually necessary to write out the process of solving problems. Writing out the problem-solving process can show your thinking and reasoning ability and help teachers and other students understand your problem-solving methods. At the same time, writing out the problem-solving process is also helpful to check whether your answer is correct and find out the mistakes. In addition, writing out the problem-solving process is also helpful to cultivate logical thinking and expression ability. Therefore, it is suggested to write the problem-solving process in foreign mathematics problems.