A cuboid iron cabinet is 0.8m in length, 0.5m in width and 0.4m in height. How many square meters of iron plate should be used at least to make this iron cabinet? What's the volume of this iron cabinet?

(0.8 × 0.5 + 0.8 × 0.4 + 0.5 × 0.4) × 2 = (0.4 + 0.32 + 0.2) × 2 = 0.92 × 2 = 1.84 (square meter), 0.8 × 0.5 × 0.4 = 0.16 (cubic meter). Answer: to make this iron cabinet, at least 1.84 square meter iron plate should be used, and the volume of this iron cabinet is 0.16 cubic meter

A rectangular wooden box, 1.5 meters, 0.8 meters wide, 6 decimeters high, to make such a wooden box, at least how many square meters of wood? How large is its floor area?

At least = 2 × (1.5 × 0.8 + 1.5 × 0.6 + 0.8 × 0.6) = 5.16 square meters
Land occupation = 1.5 × 0.8 = 1.2 square meters

A cuboid wooden box without cover, 0.8 meters long, 0.5 meters wide and 0.4 meters high. How many square meters of wood board do you need at least to make five wooden boxes

First calculate the surface area: 0.8 * 0.5 + 0.8 * 0.4 * 2 + 0.5 * 0.4 * 2 = 1.44 square meters
Another 5 wooden cases: 1.44 * 5 = 7.2 square meters

A cuboid iron cabinet is 0.8m in length, 0.5m in width and 0.4m in height. How many square meters of iron plate should be used at least to make this iron cabinet? What's the volume of this iron cabinet?