Because mathematics is closely related, how can we learn first, then line, then face and finally space? If you can't learn well, how can you learn? Therefore, the teacher is very strict, so that students can learn math well, and they will not let you come back to ask questions in the future. Of course, maybe they think that if they are stricter, students will learn better and more solidly. In short, mathematics is rigorous, because right is right and wrong is wrong, and it will not be graded like Chinese. Sometimes the teacher may use the wrong method, and he has to understand it himself. They may just be strict in teaching and not make mistakes, because students will make mistakes when they make mistakes, so they will be habitually strict.