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The math textbook is very thick.
Expand the math book as shown below.

That is, find the length and width of the big green rectangle.

Length =12+1.2+12 = 25.2 (cm)

Width =24 cm

A: The packaging needs a rectangular piece of paper with a length of 25.2 cm and a width of 24 cm.

Is there anything else I don't quite understand?

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