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现行教材在讲长方体和正方体的表面积时,没有总结出求长方体或正方体表面积的计算公式。有些老师认为这是教材编写的一个疏漏,于是好心地在教学中给学生总结出这两个计算公式,并让学生熟记应用。其实这样做,并不符合教材的缩写意图。长方体和正方体知识,是以前学过的平面图形知识的发展,也是学生学习几何初步知识由平面扩展到立体的开始。由研究平面图形扩展到研究立体图形,是学生发展空间观念的一次飞跃。通过长方体、正方体的学习,对于培养学生的空间观念有很大作用。而研究长方体和正方体的表面积,可以帮助学生弄清平面图形和立体图形的联系和区别,有利于更好地发展空间观念。现行教材在讲长方体和正方体的表面积时,故意不出现表面积的
The current textbook does not summarize the formula for calculating the surface area of a cuboid or cuboid when it comes to the surface area of cuboids and cubes. Some teachers think this is an omission teaching materials, so kindly in teaching to students summed up these two formulas, and allow students to memorize the application. In fact, this does not accord with the initial intent of the textbook. Knowledge of cuboids and cubes is the development of the knowledge of graphic graphics previously learned, and also the beginning of the expansion of the elementary knowledge of the students' learning geometry from the plane to the stereo. From the study of graphic graphics extended to the study of three-dimensional graphics, is a leap in students to develop space concept. Through the cuboid, cube learning, for the cultivation of students have a great role in the concept of space. Studying the surface areas of cuboids and cuboids can help students to find out the connection and difference between planar graphics and stereo graphics, and help to better develop the concept of space. The current teaching materials about the surface area of cuboids and cubes, deliberately do not appear surface area