Use three 6.28-meter-long iron wires to encircle the city, rectangular, square and round. Which figure has a large area? Let's make it clear

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• 1. Find the area of the plane figure surrounded by the following curve X = √ X and the line y = 0, x = 1, x = 2
• 2. Xiao Ming wants to encircle the city with iron wire. If he wants to make the triangle area 30 square meters, how long is the iron wire? Just list the equation
• 3. Use several plane figures to encircle a three-dimensional figure. Plane figures should use at least () plane figures?
• 4. To find the volume of a body of Revolution: a body of revolution formed by a curve (the square of y = x) and a figure surrounded by y = x rotating around the X and Y axes respectively? $(acontent)
• 5. Find the volume of the body of revolution formed by the plane figure surrounded by the curve y = x square and x = 3 rotating around the X axis
• 6. The volume of the body of revolution is obtained when the plane figure enclosed by the line y = √ (x-1), x = 4 and y = 0 rotates around the x-axis Review is urgent,
• 7. The volume of the body of revolution is () A. 8π3B. 10π3C. 6π3D. 32π3
• 8. A plane figure D is surrounded by a curve y = e ^ x, a straight line y = e, and a Y-axis. How to find the body of rotation formed by a rotation of plane D around the y-axis
• 9. Find the volume of the body of revolution formed by a section of arc of hyperbola x ^ 2 / 4-y ^ 2 / 9 = 1 in [2,5] and the plane surrounded by x = 5 rotating around the X axis
• 10. Find the area of the figure enclosed by the parabola y = x ^ 2 and y = 2x ^ 2, and find the volume of the solid figure formed by the figure rotating around the X axis
• 11. Use 24 cm long wire to circle the learned plane figure. Which figure has the largest area?
• 12. Use 96cm long wire to encircle a rectangular frame. The ratio of length, width and height of the cuboid is 5:2:3. How many centimeters are the length, width and height of the cuboid
• 13. As shown in the figure is the expansion of a cuboid, calculate the surface area and volume of the enclosed cuboid. (unit: decimeter)
• 14. The unfolded drawing of a cuboid may not be able to encircle the cuboid,
• 15. The three-dimensional figure of () besieged city of the cuboid
• 16. F (2x) = LNX, f (x) = lnx-ln2, how does the first step change into the second step!
• 17. If f (xn) = LNX, then the value of F (2) is () A. ln2B. 1nln2C. 12ln2D. 2ln2
• 18. It is known that f (x) = lnx1 + X − LNX, and f (x) has the maximum value at x = x0. The correct sequence numbers in the following expressions are: ① f (x0) < x0; ② f (x0) = x0; ③ f (x0) > x0; ④ f (x0) < 12; ⑤ f (x0) > 12 A. ①④B. ②④C. ②⑤D. ③⑤
• 19. The number of roots of the equation LNX = x Λ 2-4x + 4 is
• 20. The number of real roots of equation LNX + 2x-8 = 0 is () A. 0B. 1C. 2D. 3