Cut a cylinder into the largest cone. The volume of the cone is 42 cubic decimeters. The volume of the cylinder is ()

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Cut a cylinder into the largest cone. The volume of the cone is 42 cubic decimeters. The volume of the cylinder is 42 × 3 = 126 cubic decimeters

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2. If a cylinder and a cone are of equal height and equal ground, the difference between their volumes is 0.16 cubic decimeter, then the volume of the cylinder is
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14. One cubic meter of buoyancy A metal block with a volume of 0.1 cubic decimeter is hung under the spring scale. If the metal block is immersed in water, the indication of the spring scale is 6.8n, calculate the buoyancy of the metal block and the gravity of the metal block (G is 10N / kg)
15. 51.75 cubic decimeter = how many kilograms
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17. 1256789, 1 + 2 + 3, 333555, 3.5, 510, 3 / 4, 7 / 8
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19. Guess the idiom according to the number: 1 + 2 + 3 1 times 1 = 1 333555 fast
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