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原题:下图是由27个小正方体拼成的一个大正方体,把它的表面积全部涂成绿色,请想一想:(1)没有涂到颜色的小正方体有多少块?(2)一面涂色的小正方体有多少块?(3)两面涂色的小正方体有多少块?(4)三面涂色的小正方体有多少块?第一层次:尝试做。目的在于让学生尝试自己独立完成。【设计意图】实验版教材在“长方体和正方体的表面积”知识编排时有些不合理,它是按由难到易编排的。因此,学生完成这道题的结果大相径庭:对于问
Original: The following figure is a large square made up of 27 small cubes, all of its surface area painted green, please think about: (1) the number of small square without color (2) side (3) How many pieces of small cube on both sides? (4) How many pieces of small square on three sides? First level: Try to do it. The purpose is to allow students to try to do it on their own. [Design intent] experimental version of the textbook in the “rectangular parallelepiped and the surface area ” knowledge layout some unreasonable, it is difficult to easily arranged. Therefore, the result of a student completing this question is very different: for asking