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Xiaohong used three cuboid building blocks to realize the following three-dimensional modeling. What is the total area of the front and back of this three-dimensional shape? upper
Front and rear: 30 * 45 * 2+30 * 28 * 2+30 *15 * 2 = 5280 (square centimeter)

Top: 10*30*3=900 (square centimeter)

About: 45* 10*2=900 (square centimeter)

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