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Math gift box
2×3.5×2= 14 (square decimeter)

2×5×2=20 (square decimeter)

5×3.5×2=35 (square decimeter)

The third kind of packaging saves the most wrapping paper because it minimizes the area.

2×2=4 (decimeter)

(5×3.5+5×4+3.5×4)×2= 103 (square decimeter) 103×5=5 15 (yuan)

It takes at least 5 15 yuan to package such a gift box.

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