1背景(1)数学知识的有关要求《义务教育数学课程标准(2011年版)》(以下简称“新课标”)在“教学建议”中指出:数学知识的教学,应注重学生对所学知识的理解,体会知识之间的关联.在教授数学知识的过程中,教师不仅要讲授知识的实质,帮助学生理清楚相关知识的区别和联系,还应当把知识的讲授放在知识体系当中,让学生注重知识的结构和体系,引导学生建立自身的知识结构体系.在掌握数学知识的过程中,学生 1 Background (1) the relevant requirements of mathematical knowledge “compulsory education mathematics curriculum standards (2011 Edition)” (hereinafter referred to as “the new curriculum standard”) in the “teaching suggestions” that: teaching of mathematical knowledge, should focus on students In the process of teaching mathematics knowledge, teachers should not only teach the substance of knowledge, help students to make clear the difference and connection of related knowledge, but also put the teaching of knowledge on knowledge System, let students pay attention to the structure and system of knowledge, and guide students to establish their own knowledge structure.In the process of mastery of mathematics, students