Mathematics explanation in the second volume of the fifth grade - Training Enrollment Network

Mathematics explanation in the second volume of the fifth grade

A cube has 12 equal-length sides, so the side length of the cube is 18/ 12 = 1.5.

The spliced cuboid has 10 small cube faces, and the area of one face of the cube is 1.5 square, which is 2.25.

The surface area is 10×2.25=22.5.

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