The length of a rectangle is three times the width. If the width is increased by four meters and the length is decreased by five meters, its area will be increased by 15 square meters, and the original length and width of the rectangle will be reduced

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• 1. Excuse me: length 44 meters. Width 30 meters, equal to how many square meters? And for how many acres? How to calculate? Excuse me: length 44 meters. Width 30 meters, equal to how many square meters? Equal to how many mu? How to calculate?
• 2. It is 3 meters wide and 18 meters long. How many square meters is this? How to calculate
• 3. A room is six meters long and four meters wide. How many square meters is it?
• 4. The painting area of a room is about 65 square meters 【1】 In the measuring cup with 6 cubes, the water surface reading is 640 ml. after taking out the 6 cubes, the water surface drops to the 400 ml scale. The volume of each cubes is [] cubic centimeter 【2】 The painting area of a room is about 65 square meters, 0.5 liters per square meter, 50 yuan per liter of paint, and the painting cost of this room is [] yuan
• 5. The area of a room to be painted is about 62 meters. Generally, 0.5 kg of paint is needed per square meter. However, there will be loss in actual painting. Therefore, more than 110 kg of paint should be prepared. How many kg of paint should be prepared?
• 6. Xiaoli's room needs painting area of 50 square meters, and each square meter needs 0.5 kg of paint. In fact, when painting, there will be one tenth of the loss, so prepare ten more So, how much paint should be prepared
• 7. A room needs to be painted with an area of 60 square meters. According to experience, when painting for the first time, 0.5 kg of paint is used for each square decimeter, and when painting for the second time, The paint used per square meter is 2 / 3 of the first time. How many kg of paint is needed for two times of painting?
• 8. How to calculate the room area of 5 meters long, 3 meters wide and 2.4 meters high
• 9. A swimming pool is 80 meters long, 30 meters wide and 3 meters deep. 1 what is the floor area of this swimming pool? 2 tile the swimming pool if the area of each tile is 3 square minutes How many tiles should be used at least? 3. How many cubic meters of water can be injected into the pool according to the water level? 4. How many meters of water level is the total length of the water level by replacing a water level with red paint 1.6 meters on the inner wall of the pool? (answer quickly!)
• 10. If the operation a * b = the square of a - AB + B is defined, the value of 4 * (3 * 20) is calculated
• 11. How to calculate the square of a rectangle Rectangle 90 cm wide, 170 cm long, how many square? How to calculate!
• 12. A rectangle is 5 / 6 meters long and 4 / 7 meters wide. Its area is () square meters
• 13. How to square a rectangle
• 14. The length of the bottom side of the regular hexagonal prism is 2cm and the height is 6cm
• 15. The parabola y = AX2 + BX is tangent to the straight line x + y in the first quadrant. The area of the figure enclosed by the parabola and the X axis is s. find Smax
• 16. It's 24:1, 5, 5, 5
• 17. Given that Y1 = 3x and y2 = - 2-1, which quadrants does the image of function y = Y1 + Y2 pass through?
• 18. Five eights, addition, subtraction, multiplication and division can only be used once, how can it be equal to 24
• 19. Find the derivative of implicit function sin (x + 2Y) = ln XY, the answer to be detailed, thank you
• 20. By the way, can 0 be radical?