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为了通过复习课加深小学生立体几何知识的综合理解与运用,我在教学中注重让学生参与,充分利用实物加强分析与比较,培养学生初步的空间观念,收到了理想的效果。 我用玻璃制成了一密闭的长方体盒,里面存入部分红色水,相交一个顶点的三条棱长分别是1、3、5(单位:分米)。当玻璃盒以长方体的最大面作底面平放时,水深为0.5分米。我把玻璃盒在讲台上出示给学生,并告诉他们上述具体数据。学生水平观察后,再让他们侧头横向观察,并说出侧横观察时,玻
In order to deepen the comprehensive understanding and application of the three-dimensional geometry knowledge of primary school students through the reviewing class, I pay attention to letting students participate in teaching, making full use of the physical objects to strengthen the analysis and comparison, cultivating students' initial spatial concepts and receiving satisfactory results. I used glass to make a closed box of cubes containing some of the red water. The three edges intersecting one apex are 1, 3 and 5, respectively. When the glass box to the bottom surface of the largest cuboid flat, water depth of 0.5 dm. I present the glass box on the podium to the students and tell them the above data. Students observe the level, let them side lateral observation, and said when the sideways observation, glass