Cut a cuboid wood block 90 cm long, 80 cm wide and 70 cm high into the largest cube. What is the volume of the Xiao Qu part

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• 1. Cut a cube block into the largest cylinder. The volume of the cylinder is 94.2 cubic centimeter
• 2. The length, width and height of a cuboid wood block are 5cm, 4cm and 3cm respectively. If it is used to form the largest cube, the volume will be reduced by percent 3*4*5=60 3*3*3=27 60-27 / 60 = 55%, right? Why 3 * 4 * 5? Why 3 * 3 * 3?
• 3. The classroom is 80 meters long, 60 meters wide, 25 meters high, with 180 square meters of doors and windows. The ceiling and four walls of the classroom need painting. It costs 15 yuan per square meter; How much does it cost to paint the whole classroom?
• 4. A cone-shaped rice pile, the bottom circumference is 12.56 meters, 5 meters. Put the pile of rice into a cylindrical granary, just full The diameter of the bottom of the granary is 2 meters. How high is it?
• 5. A cone-shaped grain pile, with a bottom circumference of 12.56 meters and a height of 1.5 meters, loads the rice into a cylindrical granary, which is just full. The bottom of the granary is straight It's 2 meters in diameter. What's its height
• 6. The circumference of the bottom surface of a cone-shaped rice pile is 6.28 meters, and the height is 1.5 meters. The pile of rice is transported to a cylindrical granary, and the diameter of the bottom surface of the granary is known to be 1 What is the height of rice in the granary? The diameter is one meter Still waiting
• 7. A cone-shaped rice pile has a base circumference of 6.28m and a height of 0.45M. If each cubic meter of rice weighs 550Kg, is there a ton of rice in this pile?
• 8. There is a pile of grain in the corner of the warehouse. The length of the bottom arc is 2 meters and the height is 1 meter. If the weight of each cubic meter of grain is 720 kg, how many kg does the pile of grain weigh?
• 9. The cone-shaped paddy pile has a circumference of 12.56 meters and a height of 1.5 meters. It is known that each cubic meter of paddy weighs 0.75 tons. How many tons does this pile weigh? (the number obtained keeps the whole number)
• 10. There is a cone-shaped corn pile with a circumference of 62.8 meters at the bottom and a height of 3 meters. If each cubic meter of corn weighs 0.75 tons, how many tons does the pile weigh?
• 11. The volume of this cuboid is () cubic centimeter and the surface area is () square centimeter
• 12. The surface area of the cuboid model is {] square centimeter and the volume is cubic centimeter
• 13. If the height of a cuboid is increased by 2cm, it becomes a cube. At this time, the surface area is increased by 72cm_ &The volume of the original cuboid is______ cm_  ．
• 14. If the height of a cuboid is shortened by 3cm, it will become a cube. At this time, the volume is reduced by 75cm3. What is the volume of the cuboid
• 15. A cuboid is a small cuboid with a cut volume of 32 cubic centimeters, and the rest is a cube with an edge length of 4 centimeters. The surface area of the original cuboid is______ ．
• 16. The cuboid wood is 8 cm long, 6 cm wide and 6 cm high. It is sawed into the largest cube wood. What is the volume of cube wood?
• 17. Cut a cuboid 8 cm long, 5 cm wide and 3 cm high into the largest cube. What is the volume of the cube? (calculation process)
• 18. The length, width and height of a rectangular block are 10 cm, 8 cm and 6 cm respectively. If you saw it into the largest cube, how many percent of its volume will be reduced?
• 19. Cut a cuboid 20 cm long, 16 cm wide and 12 cm high into the largest cube. How many cuboids are left
• 20. A cuboid is 20 cm in length, 12 cm in width and 8 cm in height. After cutting out the largest cube from the cuboid, the volume of the remaining part is smaller Is it () cubic centimeter?