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2018年秋七年级数学上册第4章4.1几何图形4.1.1立体图形与平面图形第2课时折叠、展开与从不同的方向观察几何体预习（1）课件（新版）新人教版.ppt

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2018年秋七年级数学上册第4章4.1几何图形4.1.1立体图形与平面图形第2课时折叠、展开与从不同的方向观察几何体预习（1）课件（新版）新人教版.ppt_第1页
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第四章 几何图形初步,4.1 几何图形 4.1.1 立体图形与平面图形,第四章 几何图形初步,第2课时 从不同的方向看立体图形,第2课时 从不同的方向看立体图形,探究新知,活动1 知识准备,三角形,梯形,圆柱,圆锥,正方体,圆,球,第2课时 从不同的方向看立体图形,活动2 教材导学,上面,正面,侧面,从不同的方向看立体图形,第2课时 从不同的方向看立体图形,2我们曾经学过苏轼的题林西壁：横看成岭侧成峰，远近高低各不同不识庐山真面目，只缘身在此山中诗中蕴涵了一个怎样的数学原理？,答案 在观察同一个物体的时候，由于方向和角度不同，可能看到的图形不同，因此所得结论也不一样,

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