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数轴,是初中数学的一个重要概念,是学生学习有理数的运算、平面直角坐标系的基础.人教版教材将数轴安排在七年级上册第一章有理数之中,这节内容的学习将使学生第一次接触到数形结合思想,体会其在数学问题解决中的价值.因此,我们要高度重视从实际情境中抽象出数轴的过程的设计,创造出利于认知冲突生成的情境,让学生体会到数轴出现的必要性和适时性.一、“1.2.2数轴”教学片断问题:在一条东西向的马路上,有一个汽车站牌,汽
The number of axes, is an important concept of mathematics in junior high school, is the basis for students to learn rational number of operations, Cartesian coordinate system. PEP set the number of axes in the seventh grade on the first chapter rational numbers, the content of this study will enable students For the first time, we have come into contact with the idea of number-form combination and realized its value in solving mathematical problems.Therefore, we should attach great importance to the design of the process of abstracting the axioms from the actual situation and create the situation conducive to the generation of cognitive conflicts so that students First, “1.2.2 axis ” teaching piece problem: in an east-west road, there is a bus stop sign, steam