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从心理学层面看,学生具有感受全貌的需要和动力;教育学理论也认为,缺乏体系的学习,是低效的学习;从数学学科的特征看,数学知识系统的建构,有助于知识的深化理解,有助于学生学习能力和研究能力的提升.寻求联系,通过变式将看似杂乱的内容巧妙地连接起来,使得课堂更为流畅,从而提高教学效益.变式不外乎结构的变式(如结论的推延、逆向思考等)和对象的变式(研究对象的一般化、特殊化、具体化、泛化
From the perspective of psychology, students have the need and motivation to feel the whole picture; pedagogy theory also believes that the lack of system learning is inefficient learning; from the characteristics of mathematics, the construction of mathematical knowledge system contributes to knowledge Deepen understanding helps to improve students’ learning abilities and research ability.Collecting to connect, through the variants of the seemingly messy content cleverly connected, making the class more fluid, thereby enhancing the teaching effectiveness .Variety of nothing more than structure Variants (such as the conclusion of the delay, reverse thinking, etc.) and the object variants (research object generalization, specialization, specificization, generalization