Take a rectangular paperboard 8 cm in length and 6 cm in width, and cut off four small cubes 1 cm in side length from four corners to make a cuboid carton without cover Find the volume of this cuboid

Take a rectangular paperboard 8 cm in length and 6 cm in width, and cut off four small cubes 1 cm in side length from four corners to make a cuboid carton without cover Find the volume of this cuboid

The volume of cuboid = (8-2 × 1) × (6-2 × 1) × 1 = 24cm & # 179;

What plane graphics can be generated by cutting a cube carton without cover along some edges?

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(black means yes, white means blank)
A total of eight, our teacher said, give points

1. How many square decimeters of hard paper is needed to make a square paperless carton with an edge length of 4 decimeters?
2. A cuboid water tank is full of water. At this time, put a cuboid stone which is 1 decimeter high and 1 decimeter wide. When the water overflows 1 liter, how many decimeters is the length of this stone?
3. The edge length of a cube tank is 2. How many liters of oil can this tank hold? Pour oil into this mailbox. The measured oil depth is 0.8 decimeter, decimeter. How many liters of oil can be poured in?
4. A cube steel lake with an edge length of 40 cm is forged into a cuboid steel with a height and width of 20 cm. How long is the forged steel?

1) 4 * 4 * 5 = 80 cubic decimeter
2) 1 / 1 * 1 = 1 decimeter
3) 2.5 * 2.5 * 2.5 = 15.625l
2.5 * 2.5 * 0.8 = 5 liters
4) 40 * 40 * 40 / 20 * 20 = 160cm