第一题：图解见如下链接
第二题：相当于每一面按#方法切,三面：即八个顶角有8个；两面：正方形六面每面有四个但都被重复计算一次,4*6/2=12；一面：正方形六面每面中间有一个即6个；零面：中心1个.
1.A round table is pushed into the corner of a rectangular r
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