The height of two cylinders is equal, the bottom radius of the big cylinder is equal to the bottom diameter of the small cylinder, and the volume of the small cylinder is 12______ ．

Let the height of two cylinders be h, the bottom radius of the big circle be r, then the bottom radius of the small circle be R2, the volume of the big circle is h π R2, the volume of the small circle is r2h π, the volume of the small circle is r2h π, the volume of the big circle is r2h π △ h π R2 = 14; answer: the volume of the small circle is 14 of the volume of the big circle

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1. The height of two cylinders is equal. If the radius of the bottom of the large cylinder is exactly the diameter of the bottom of the small cylinder, what is the volume of the large cylinder School starts tomorrow
2. The diameter of the bottom of the cylinder is 2cm, and the volume of the existing cylinder is several times that of the original cylinder after enlarging by 3:1
3. A cylinder and a cone have the same circumference and height at the bottom. The volume of the cone is 3.6 cubic decimeters, and the volume of the cylinder is 3.5 cubic meters
4. The sum of the volumes of a cylinder and a cone with equal base and height is 120 cubic decimeters, and the volume of a cylinder is 120 cubic decimeters______ Cubic decimeter, the volume of a cone is______ Decimeter
5. After putting a cylinder 8 decimeters high into an approximate cuboid with the same base as the cylinder, the surface area increases by 24 square minutes, and the volume of the cylinder is the sum of the formula and the formula
6. A cylinder with a diameter of 8 cm at the bottom is cut into two pieces vertically along the diameter of the bottom. The surface area is increased by 112 square centimeters. What is the volume of the cylinder
7. An 8 cm high cylinder is cut into an approximate cuboid. Its surface area is 48 square centimeters larger than that of the original cylinder______ Centimeter, the volume is______ Cubic centimeter
8. A cylinder with a diameter of 5cm at the bottom and a height of 12cm is cut into two and a half cylinders along the diameter, and the surface area is increased______ ．
9. If the height of a cylinder increases by 2 cm, its surface area will increase by 50.24 square cm. If the height decreases by 2 cm, it will be equal to the diameter of the bottom surface, and the volume of the cylinder will increase How many?
10. 1. A cylinder with a radius of 4cm is cut along the diameter of the bottom surface, and the surface area is increased by 40 square centimeters. What is the volume of the cylinder 2. A cone with a bottom radius of 3 decimeters is cut vertically along the height, and the surface area increases by 60 square decimeters. What is the volume of the cone
11. There are two cylinders of equal height. The ground diameter of the large cylinder is 20% larger than that of the small cylinder. The volume of the large cylinder is 360 cubic centimeters
12. The two cylinders are equal in height, the ratio of bottom area is 3:5, the volume of cylinder a is 12m & sup3;, and the volume of cylinder B is () M & sup3? The two cylinders are equal in height, the ratio of bottom area is 3:5, the volume of cylinder a is 12m & sup3;, and the volume of cylinder B is () M & sup3?
13. There are two cylinders with the same diameter at the bottom. The height ratio of the two cylinders is 7:4. The volume of the second cylinder is 24 cubic decimeters less than that of the first cylinder How much is it
14. There are two cylinders with the same diameter at the bottom. The ratio of height is 7:4. The volume of the second cylinder is 24 cubic decimeters. What is the volume of the first cylinder
15. The ratio of the height of the first cylinder to the height of the second cylinder is 3:4. The volume of the first cylinder is 24 cubic decimeters, and the volume of the second cylinder is 24 cubic decimeters
16. The volume difference between a cylinder and a cone is 12.56 cubic centimeters. If the radius of the bottom of the cone is 2 centimeters, the cone will be the same How high is it?
17. 5 out of 9-1 out of 12 = 7 out of 12 write clearly
18. If you move the number 1 from the left to the right, the new number will be three times of the original number______ ．
19. Given that the function f (x) = (m2-m-1) x & nbsp; M2 + m − 3 is a power function and X ∈ (0, + ∞), f (x) is an increasing function, the analytic expression of F (x) is obtained
20. If f (2x) = - 2x ^ 2 + 5x-7, then f (2)=