For a cuboid with a square bottom, the total length of edges is 120cm, and the height is three times more than the side length of the bottom. The surface area of the cuboid can be calculated

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• 1. If the length of a rectangle is reduced by 9cm and the width is increased by 6cm, it becomes a square, and the areas of the two figures are equal. Find the length and width of the original rectangle
• 2. If the length of a rectangle is reduced by 9cm and the width is increased by 6cm, it becomes a square, and the areas of the two figures are equal. Find the length and width of the original rectangle Solution of linear equations with two variables
• 3. If the length of a rectangle is reduced by 9cm and the width is increased by 6cm, it will become a square, and the areas of the two figures are equal . please!
• 4. 1. Calculate the area of the figure. (all units are cm). The bottom of the rectangle is 8.6cm, the height is 6cm. How many square centimeters is the area? Parallelogram bottom is 4.5, height is 2.8, area. Parallelogram bottom is 7.5, height is 3.12, area. Triangle bottom is 7.6, height is 12.5, area. Triangle bottom is 5.5, height is 10.2, area. Trapezoid bottom is 4.2, bottom is 6.8, height is 4, area. Trapezoid bottom is 3.5, bottom is 8.7, height is 2.4
• 5. In a group of rectangles with fixed area, when one side of the rectangle is 6cm long, the other side is 8cm long, let the two sides of the rectangle be x (CM), y (CM) To find the analytic expression of the function of Y with respect to x, is this function an inverse scale function? If so, please point out the practical significance of the scale coefficient
• 6. In a group of rectangles with fixed area, when one side of the rectangle is 6cm long and the other side is 8cm long, let x (CM) and Y (CM) be the two sides of the rectangle respectively [(1) find the analytic expression of the function of Y with respect to X. is this function an inverse scale function? If so, please point out the practical significance of the scale coefficient.] otherwise, I won't. [(2) in a rectangle, if the ratio of the two sides of a rectangle is 3:1, what is the perimeter of the rectangle?] otherwise, I won't]
• 7. The side length of a right triangle is 6cm, 8cm and 10cm respectively. The area of the triangle is [] square centimeter, and the height of the hypotenuse is [] cm
• 8. If the circumference of a rectangle is 12cm and its length is x, then the analytic expression of the function of Y with respect to X is? What is the value range of the independent variable x?
• 9. A rectangle with a length of 12cm and a width of 8cm is reduced by 1:4. The perimeter of the figure is () cm and the area is () square cm
• 10. If the circumference of a rectangle is 12cm, if the length is reduced by 1cm and the width is increased by 2cm, it is a square, then the area of the rectangle is CM & sup2; It's better to be an equation, but the formula is OK. If there is a fine process
• 11. How many cm are the length, width and height of the cuboid to maximize the surface area? There are analysis and steps
• 12. Two cuboids with a length of CM, a width of 3cm and a height of 1cm are used to form a large cuboid. The largest surface area of the cuboid is () and the smallest is ()
• 13. The first time is 1, the second time is 3, the third time is 6, the fourth time is 10, and the N times is how many cm is the circumference of the figure No wealth, sorry
• 14. If a rectangle whose length is 1cm more than its width is equal to the perimeter of a square whose side length is a cm, the length of the rectangle is (). A 2a-1 / 2 B 2A + 1 / 2
• 15. Saw a cuboid with 48 square cm cross section and 3M long into three sections, how many square cm has the surface area increased?
• 16. How many square decimeters can the surface area increase at most and how many square decimeters can the surface area increase at least by sawing the wood below into two cuboids? It's 3 decimeters wide. OK, add points
• 17. A cuboid is 8cm in length, 6cm in width and 5cm in height. Saw it into two identical cuboids. What is the maximum increase in surface area 5cm high
• 18. Cut a rectangular wood 8 cm long, 6 cm wide and 4 cm high into two rectangles. What is the maximum sum of the surface area of the two rectangles
• 19. Saw a 2.4-long cuboid wood into 5 sections, the surface area increased by 96 square centimeters, find the original volume of the wood is how many cm
• 20. The four sides of the cuboid with a square bottom can just form a square with a side length of 8cm to calculate the cuboid volume