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正方体是我们生活中最常见的几何体之一,由于它既是轴对称图形,又是中心对称图形,具有完美的对称美,从而具有“神奇”的作用。在上人教版《必修2》的新课时,我深有体会:首先是在讲空间几何体时,讲到求体积面积时,一般做题时不会单独只要你求正方体的体积面积,而是要你求正方体的内切球、与各棱均相切的球、外接球的体积面积,但这些球的体积面积只与半径有关,这时需要学生理解正方体的内切球的球心到各个
A cube is one of the most common geometries in our life. Because it is both an axisymmetric graph and a centrosymmetric graph, the cube has perfect symmetry and thus has a “magic” effect. In the PEP “compulsory 2” new class, I deeply understand: The first is talking about the space geometry, speaking about the volume area, the general problem will not be as long as you ask for the cube of the volume area, but You want to ask the cube of the inside of the ball, with each edge are tangent ball, the external ball of the volume area, but the volume of these balls only with the radius, then need students to understand the cube of the ball inside the ball into the heart