&Frac12;, & frac34;, 7 / 10, 17 / 24, 47 / 58, what's the next number?

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• 1. Just choose to fill in the blanks. It's said that it's good to practice for a few days
• 2. 2011/2011*2011/2012+1/2013=?
• 3. Simple calculation of 1.7 * 24.5 + 0.7 * 76.5-0.7
• 4. How to calculate 328-76 + 24?
• 5. Simple calculation of 0.7 * 24.5 + 0.7 * 76.5-0.7
• 6. Simple calculation of 36 × 1.9-0.9 × 36 (270-30 × 9) △ 5.564 + 8 × 9258 + (124-24 × 3) 860 - (48 + 12) × 12 It's for school tomorrow
• 7. How much is 100 cents
• 8. If M = {x | log2 (x-1) is less than 1}, and N = {x | a quarter is less than (a half) x power is less than 1, then M intersects n= Urgent
• 9. A number plus 5 times 4 equals 36. Find this number Using equation
• 10. Given the function f (x) = x 2 + ax + 3, when x ∈ [- 2,2], f (x) ≥ A is constant, and the minimum value of a is obtained
• 11. 58 * 3 / 7 + 12 / 2 and 1 / 3
• 12. What is 58 + 1?
• 13. How to solve the equation 2 * (58-x) - 19 = 55 + X
• 14. If you can calculate simply, you should calculate simply! 1. (27 / 4-19 / 5) △ 4 / 5 2. (14 / 29 * 29 + 58 / 9 * 29) * 5 / 4
• 15. Practical questions (30 19:1:19) Mechanical processing needs lubrication to reduce friction. An enterprise needs to process 90kg lubricating oil for a large-scale mechanical equipment, and the reuse rate of lubricating oil is 60%. According to this calculation, the actual oil consumption of processing a large-scale mechanical equipment is 36kg. In order to build a conservation oriented society and reduce oil consumption, a workshop of the enterprise organized personnel to tackle key problems to reduce the actual oil consumption, It not only reduces the lubricating oil consumption, but also improves the reuse rate of lubricating oil. It is found that on the basis of technological innovation, the reuse rate of lubricating oil consumption will increase by 1.6% for every 1kg reduction in lubricating oil consumption. In this way, the actual oil consumption of processing a large mechanical equipment will decrease to 12kg, How many kilos of lubricating oil is used for processing a large mechanical equipment? What is the reuse rate of lubricating oil?
• 16. Practical questions are urgent! (14 16:58:9) It is known that a project can be completed within 12 days by the cooperation of team a and team B, and the total cost of the project is 13800 yuan. The time required for team B to complete the project alone is 1.5 times that for team a to complete the project alone, and the daily cost of team a is 150 yuan more than that of team B (1) How many days does it take for team a and team B to complete the project separately? (2) If the project management department decides to select one of the two teams to complete the project independently, which team should be selected in order to save money? Please explain the reason
• 17. Quadratic function, practical problems Zhenhua agency sells a kind of building material on behalf of a factory. When the selling price per ton is 260 yuan, the monthly sales volume is 45 tons. In order to improve the operating profit, the agency is prepared to reduce the price for promotion. According to the market survey, when the selling price per ton decreases by 10 yuan, the monthly sales volume will increase by 7.5 tons, A total of 100 yuan will be paid to the manufacturer and other expenses for each ton of building materials sold. Suppose the selling price of each ton of materials is x yuan, and the monthly profit of the distributor is y yuan (1) Find the functional relationship between Y and X (it is not required to write the value range of x) (2) When the selling price is set at RMB per ton, what is the maximum monthly profit of the store?
• 18. Given that the image of quadratic function y = x2 + BX + C is shifted 2 unit lengths to the left and 3 unit lengths to the up, we get the quadratic function y = x2-8x + 10. (1) find the values of B and C; (2) if the intersection of the function in question (1) and the X axis is a and B, try to determine a point P on the image below the X axis, so that the area of △ PAB is the largest. Can you find the area of △ PAB?
• 19. Practical problems of quadratic function in Junior Three 1. A shopping mall sold a refrigerator with a purchase price of 2000 yuan at 2400 yuan, with an average of 8 refrigerators sold every day. In order to cooperate with the implementation of the national policy of "home appliances to the countryside", the shopping mall decided to take appropriate degradation measures. The survey shows that for every 50 Yuan reduction in the price of this refrigerator, an average of 4 more refrigerators can be sold every day (1) Suppose that the price of each refrigerator is reduced by X Yuan, and the profit of this refrigerator is y yuan. Please write the function expression between Y and X (do not write the value range of the independent variable) (2) In order to make a profit of 4800 yuan per day in the sales of this kind of refrigerator, and at the same time make the people get benefits, how much should each refrigerator be reduced? (3) When the price of each refrigerator is reduced by how much yuan, the profit of this kind of refrigerator is the highest? What is the highest profit? 2. In order to meet the needs of accommodating tourists, a folk tourist village has opened a hotel with 100 beds. When the daily charge for each bed is 100 yuan, all the beds can be rented out. If the daily charge for each bed is increased by 20 yuan, 10 beds will be reduced correspondingly. If the daily charge for each bed is increased by 20 yuan, the number of beds initially rented out is small and the rent is high, So how much is the most appropriate charge per bed per day? Urgent need to answer, to process! Very urgent! That pro know, please write it! Thank you very much!
• 20. A store bought a batch of daily necessities with a unit price of 16 yuan. After selling for a period of time, in order to obtain more profits, the store decided to increase the selling price. According to the test, if the price is 20 yuan per piece, 360 pieces can be sold per month; if the price is 25 yuan per piece, 210 pieces can be sold per month. Suppose that the number of pieces sold per month y (pieces) is a function of the price x (yuan / piece). (1) ）Try to find the relationship between Y and X; (2) under the condition that there is no overstock of goods and other factors are not considered, how much is the selling price to make the maximum profit every month? What is the maximum monthly profit (total profit = total revenue - total cost)?