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课本是教学的依据。数学课本中的语言精炼，取述严谨，科学性强。所以我在数学中十分重视发挥课本的作用。比如，为了使学生能运用已有的知识顺利地掌握两位数减一位数退
Textbooks are the basis for teaching. The language in mathematics textbook is refined, with strictness and scientificness. So I attach great importance to the role of textbooks in mathematics. For example, in order to enable students to use existing knowledge to successfully grasp the double-digit minus one-digit retreat