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数学知识的一个重要特点是具有抽象性,学生思维处于以形象思维为主的阶段,要使学生理解概念单凭教师的语言阐述,那是达不到要求的。
An important feature of mathematical knowledge is abstract. Students’ thinking is in the stage of image-based thinking. It is impossible for students to understand the concept only in the language of teachers.