The floor of a room is made of two colors of floor tiles. There are 40 white floor tiles and 20 black floor tiles (1) write out the floor area ratio of two kinds of floor tiles and simplify them. (2) if the area of the room is 15 square meters, how many square meters are the floor areas of the two kinds of floor tiles?

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• 1. Black brick has 20, white brick has 40, the area of this room is 15 square meters, ask the area of two kinds of floor tile? The floor of a room is paved with black and white tiles. There are 20 black tiles and 40 white tiles. If the area of the room is 15 square meters, what are the areas of these two kinds of floors?
• 2. =There are 1760 pieces of blue and white tiles in total. 60% of blue tiles and 514 pieces of white tiles are used. There are as many tiles left. How many of the two tiles are there To solve the equation
• 3. If the area of the room is 15 square meters, how many square meters are the floor areas of the two kinds of floor tiles
• 4. How to calculate the floor tile for the room area
• 5. How to calculate how many tiles a room needs?
• 6. Why is the indoor budget calculated? For example, the floor area of a room is directly multiplied by a quotation to count 600 * 600 floor tiles
• 7. Calculate ceramic tile dosage, 4 meters, know room floor area, wall area how to calculate? What formula is the most standard?
• 8. How many tiles do you need to use if you want to use a 6-decimeter-long square tile for your room? How many tiles do you need if you want to use a 12 decimeter square tile instead
• 9. Xiao Li's new home is 80 decimeters long floor tiles to lay the ground, which needs 200 pieces. If you use square tiles with an area of 1 square meter to lay the floor, how many pieces do you need? What's the area of the house? Why 128 yuan, 130 square meters,
• 10. How many floor tiles does it take to build 146 square houses with 80 by 80 cm floor tiles
• 11. A rectangular wood block is cut off 2DM from the top and 3DM from the bottom, and the rest is just a square. The known cut-off area is 120 square decimeters. Calculate the volume of the original cuboid
• 12. There is a rectangle. If its width is reduced by 2 mm or its length is reduced by 3 DM, its area will be reduced by 24 square decimeters. What is the original area of this rectangle?
• 13. A rectangular piece of glass, 5 decimeters long, 3 decimeters wide, the remaining part is a square. Known cut area is 71 square decimeters, then the remaining square area is______ Square decimeter
• 14. A cuboid wood is 4m long, 3DM wide and 3DM high. After sawing it into two sections, how many square decimeters has the surface area increased?
• 15. How many square decimeters has the surface area increased after sawing it into two sections,
• 16. How many square decimeters has the surface area increased after sawing it into two sections? (fast) Respondent: 784252835 This responder, so that I can understand
• 17. A 2.5m long cuboid wood has a square bottom and a side length of 3DM. If the wood is said to be divided into three sections, how many square decimeters will the surface area increase? Tell me why
• 18. Known a quadratic function analytic formula: y = - 0.5x2 + 4x-3, find the symmetry axis and vertex coordinates of this function analytic formula (please write the process)!
• 19. The fruit shop shipped 600 kg of apples, pears and oranges. The apples were 80 kg less than the pears, and the oranges were 20 kg more than the pears?
• 20. How to write the third question on page 39 of supplementary exercises of mathematics in Volume 2 of grade 5 of Jiangsu Education Press Five trucks of cement, 30 bags each, were delivered from the construction site. If the cement is used up in six days, the average daily use of () bags, daily use of this batch of cement (fraction), is (fraction) of the car.