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棱长为a的正方体摆放成如图1所示的形状.问:(1)有几个正方体?(2)它们的表面积是多少?解决这道题,需要丰富的空问想像力.
The cube with the length a is placed in the shape shown in Figure 1. Q: (1) How many surfaces are there? (2) What is their surface area? To solve this problem, we need a lot of space imagination.