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现行的初中数学人教版新教材对几何部分的内容做了很大调整,其中增设图形的四个“变换”:平移、对称、旋转和位似这四个变换.相对于老教材,这四个“变换”提升了学生对几何图形的空间认识高度.在为近代数学中,“变换”是一个蕴涵丰富数学思想的数学概念,尽早出现在初等几何中,是借助一个图形与另一个图形建立直观、形象的对应关系,来形成对“变换”这一重要数学概念浅显的数学认识,目的是为学生今后数学学习铺下基石.
The current new textbook for junior high school mathematicians teaches students to make great adjustments to the contents of the geometric part, which includes four “transforms” of graphics: translation, symmetry, rotation, and similarity. These four transformations are relative to old textbooks. These four “transforms” enhance the student’s spatial understanding of geometry. In modern mathematics, “transformation” is a mathematical concept that implies rich mathematical ideas. It appears in elementary geometry as early as possible. The graphical and other graphics establish an intuitive, image-based correspondence to form a mathematical understanding of the important mathematical concept of “transformation,” which aims to lay the cornerstone for students’ future mathematics learning.