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A rectangular solid P has height $$2c$$ and a base of width $$a$$ and length $$b$$. Two other rectangular solids, $$Q$$ and $$R$$, each have height c and bases of width $$a$$ and length $$b$$. Which of the following represents the amount by which the sum of the surface areas of $$Q$$ and $$R$$ exceeds the surface areas of $$P$$?
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以上解析由 考满分老师提供。
