下图显示了一个正方体。图中 P、Q、R 或 S 面中的哪一个不是该正方体展开图的一部分？

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完整解法

1. Mentally fold the net to identify overlapping faces.

Let the blank square directly below P be the Right face, and R be the Base.
Folding the net:

The blank square below P becomes the Right face.
P (above the Right face) folds to become the Top face.
Q is attached to the right of P. When P is the Top face, Q folds down to become the Left face.
However, S (to the left of R) already folds up to become the Left face.
Since Q and S would overlap and occupy the same position (the Left face), one of them must be removed. Removing S would disconnect the blank square below it, so Q must be the extra face.

答案

Q (option 2)

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