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同学们不防将一些正方体的纸盒,沿着棱按不同方式将其剪开(但不要剪断,六个面要通过边连在一起)展成平面,再观察、对比一下不同形状的图形。如果不容易找到足够的
Students will not be able to put some square cartons cut along the edges in different ways (but do not cut, the six sides to be connected by the edge) into a plane, and then observe and compare different shapes of graphics. If not easy to find enough