How to do the simple operation of 1311 × 79.45 + 159 × 47.56 + 1591 × 52.44?

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• 1. Simple calculation 23.8×4+17.2×4 16.75-0.42-4.58 10.1×8.3 0.125×8.8 0.25×17×40
• 2. What about 3, 4, 8, 17, (), 58
• 3. - 64) + 17 + (- 26) + 58
• 4. 14 22 () 44 58
• 5. How to calculate 44.4 * 3.6 + 44.4 + 22.2 * 0.8 simply I need the answer tonight. This is the help on the test paper. Thank you
• 6. A simple method was used to calculate (2.9 * 2.5) * 0.47.65 - (4.58-2.35) 30.5 * 20.8-305 * 1.08 (6.4-22.4 / 14) * 0.35
• 7. Basic algorithm statement problem (15 12:0:58) The known conversion formula between Fahrenheit temperature and centigrade temperature is: (Fahrenheit temperature - 32) * 5 / 9 = centigrade temperature Write a program, input a Fahrenheit temperature, output its corresponding centigrade temperature Use input, output, assignment statements to answer  
• 8. 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)?
• 9. 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!
• 10. 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?
• 11. 46 * 5.6-4.5 * 56 simple operation
• 12. 56 × 295 + 56 × 6-56 =? Urgent, simple operation!
• 13. Given 333111112: □ = 37:54 + 55 + 56 + 57 + 584 + 5 + 6 + 7 + 8, what is the number represented by the box?
• 14. The sum of the first several terms of the arithmetic sequence - 10, - 6, - 2,2 is 54? How does the process of finding the middle come from
• 15. The sum of the first several terms of the arithmetic sequence - 10, - 6, - 2,2. Is 54
• 16. Arithmetic sequence - 10, - 6, - 2,2 How many of the top items of the sum of 54?
• 17. According to the formula, first find the number of terms, and then find the sum of arithmetic sequence. (1) 7 + 10 + 13 + 16. + 100 (2) 16 + 21 + 26 +. + 206 Everybody, you're smart! Be sure! There won't be any chance on Friday! Use the tail of the item!
• 18. The arithmetic sequence is in the arithmetic sequence 213206199192,. 94,87, in which the 10th item is the number
• 19. In the sequence {an}, A1 = 2, a (n + 1) = an (n + 1) / N, find the general formula of {an}
• 20. High one mathematics ~ arithmetic series solution, thank you! In the arithmetic sequence {an}, S10 = 120, then the value of A2 + A9 is? Brother on the first floor, can you be more detailed? I really don't understand!