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A kind of rectangular gas stove packing box, 8 decimeters long, 4 decimeters wide, 5 decimeters wide. How much cardboard does it take to make this packing box? How many square meters is it? How many cubic decimeters is the volume of the packing box? How many cubic meters is it?
Surface area of cuboid = (L × W + L × H + W × h) × 2
=（8×4+8×1.5+4×1.5）×2
=50×2
=100 square decimeters
100 square decimeter = 1 square meter
Cuboid volume = length × width × height
=8×4×1.5
=48 cubic decimeter
48 cubic decimeter = 0.048 cubic meter
The bottom surface of a cuboid alloy is 80cm long, 60cm wide and 100cm high. Now we need to chain press it into a new cuboid, and its bottom surface is a 40cm square
80*60*100/40/40=300
How many cubes can a cuboid with a length of 100cm, a width of 60cm and a height of 40cm be divided into?
At least, it means that the side length of a cube is the largest. At the same time, the side length of a cube should be the divisor of the side length of a cuboid. Therefore, the side length of a cube is 20, so there are two layers. There are 15 in one layer, so there are at least 30
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