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Use a 6-meter-long wire to make a cuboid frame. How many cubic meters is the largest volume of the frame? I'm going to study tomorrow. I'll repay you with 5 points
Only when it is made into a cube (special cuboid), the volume is the largest,
Length: 0.5 / 12 m
Volume: 0.5 * 0.5 * 0.5 = 0.125 cubic meters
What is the calculation formula of power consumption? What is the unit?
General electrical appliances are marked with kW / h, for example, 1kW / h, which means one kilowatt hour. Refrigerator is marked with 0.45kw/24h, which means 0.45kw/24h a day. I don't know any formula. Can I give you this example? I hope my answer is helpful to you
How to find the rate, unit one. How to find the corresponding rate. To formula
And explain the back there. Or front.
For example: the proportion of male students in the total number is a score rate. If the total number is regarded as a 1, the proportion of male students is the corresponding score rate
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- 12. A 12dm long iron wire is used to form a frame in the shape of the largest cube. The volume of the cube is () cubic decimeter, The surface area is () square decimeters
- 13. The cross section of a rectangular square steel is a square with a side length of 4cm, and the square steel is 3.2m long. If the weight of steel per cubic decimeter is 7.8kg, how many kg does the square steel weigh?
- 14. A square steel is 2.5 meters long. Its cross section is a square with a side length of 6 cm. If the square steel weighs 7.8 kg per cubic decimeter, how many kg does the square steel weigh? Want a formula
- 15. A square steel is 4 meters long. Its cross section is a square with a side length of 5 cm. It is known that the weight of steel per cubic decimeter is 7.8 kg. How many kg does this square steel weigh
- 16. There are four square pillars in the dining hall, 5 meters high. The bottom is a square with a side length of 6 decimeters and decorated with square bricks with a side length of 2 decimeters How many bricks? What is the volume of each square column?
- 17. With a rope around the column circle, the rope is more than 40 cm, if around the column three circles, the rope is less than 20 cm, how long is the rope! With a rope around the post 2 times, the rope is more than 40 cm, if around the post 3 times, the rope is less than 20 cm, how long is the rope!
- 18. If a rope is wound around the post for two turns, the rope will be 40 cm more. If it is wound around the post for three turns, the rope will be 20 cm less. How long is the rope?
- 19. There are many thick round pillars in the Palace Museum. A 7-meter-long rope is 0.72 meters long around one of them How many meters is the diameter of this column?
- 20. Use a 7-meter-long rope to circle the hall pillar for 2 times, with 0.72 meters left. What is the floor area of this pillar?