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A cuboid outer packing carton is 0.8 meters long, 0.4 meters wide and 0.15 meters high. How many square meters of cardboard should be used to make the carton
（0.8×0.4+0.8×0.15+0.4×0.15）×2
=（0.32+0.12+0.06）×2
=0.5×2
=1 (M2)
The utility model relates to a packing box for a gas range, which is a cuboid, 7 / 10 in length, 2 / 5 in width, and is quick
《1》 How many square meters of cardboard should we use to make this packing box?
It's actually the surface area of this cuboid
You need cardboard
=2 × (L × W + L × H + W × h)
=2 × (7 / 10 × 5 / 2 + 7 / 10 × 2 / 1 + 2 / 5 × 2 / 1)
=1.66 square meters
The edge length of a cube packing box is four fifths of a meter. How many square meters of cardboard does it need to make such a packing box? What is the volume of this packing box?
To make such packing box, at least 4 / 5 × 4 / 5 × 6 paperboard = 96 / 25 (M2)
The volume of this packing box is 4 / 5 × 4 / 5 × 4 / 5 = 64 / 125 cubic meters
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