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在研究空间几何体问题时,展开是一种常见的图形变换形式,是“降维”思想的生动体现,也是新课程标准的要求.人教A版《数学2》
Expansion is a common form of graphic transformation in the study of spatial geometry, which is a vivid manifestation of the idea of “dimension reduction” and also a requirement of the new curriculum standard.People teach A version of “Mathematics 2”