Solve the equation 5x + 18 = 3x + 44 15x-1.4 * 5 = 5x + (107-2.2) Tonight,

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• 1. Practical problems and quadratic equations of one variable 1. To make a product, the original cost price of each product is 500 yuan, and the sales price is 625 yuan. According to the market forecast, the sales price of the product will decrease by 20% in the first month, and increase by 6% in the second month. In order to make the sales profit after two months be the same as the original sales profit, what percentage of the average monthly cost price of the product should be reduced? 2. When a shopping mall sells a certain commodity, the purchase price of each product is 2500 yuan. When the sales price is 2900 yuan, it can sell 8 units per day on average. When the sales price is reduced by 50 yuan, it can sell 4 more units per day on average. If the shopping mall wants to make the sales profit of this product reach 5000 yuan per day on average, how much should the price of each product be
• 2. Practical problems and quadratic equations with one variable. Practical problems and quadratic equations with one variable. Practical problems and quadratic equations with one variable. Practical problems and quadratic equations with one variable The output of an electric bicycle factory in March was 1000 units. Due to the increasing market demand, the output in May increased by 1210 units. Then, the average growth rate of the factory in April and may was?
• 3. 1. Group A and group B made 144 animal specimens within 6 hours. Group a made 14 specimens per hour. How many specimens per hour did group B make? 2. There are 70 meters of cloth, which can be used to cut 20 sets of adult clothes and 12 sets of children's clothes. Each set of clothes uses 1.6 meters of cloth. How many meters of cloth does each set of adult clothes use?
• 4. In order to stimulate domestic demand, auto purchase tax subsidy activities across the country officially started in 2009. A dealer sold 960 manual and automatic cars of a certain brand in the month before the policy was issued, and 1228 cars of these two models were sold in the first month after the policy was issued. The sales of manual and automatic cars increased by 30% and 25% respectively compared with the month before the policy was issued %(1) in the month before the policy was issued, how many manual and automatic cars were sold? (2) If the price of a manual car is 80000 yuan, and that of an automatic car is 90000 yuan. According to the subsidy policy, the government subsidizes the users who buy cars at 5% of the price of each car. In the first month after the introduction of the policy, how much or less 10000 yuan has the government subsidized the 1228 car users?
• 5. The key of solving practical problems by quadratic equation of one variable is
• 6. 3/4x-1.2=3/5x
• 7. Equations solve practical problems about fractions 1. The number of science and technology books in the library is equivalent to 5 / 12 of story books [1] If there are 360 storybooks, how many are there 【2】 If there are 150 science and technology books, how many story books are there? Xiao Ming read a quarter of the book, and the next day he began to read it from page 25. How many pages is the book? Using equation
• 8. What's the difference between integral equation and fractional equation?
• 9. The basic idea of solving fractional equation is to transform fractional equation into integral equation
• 10. A basic equality relation often used in solving practical problems is "two different formulas representing the same quantity"
• 11. 11/2÷ 0.4=1.35÷ x；12+3（x-1）=18；5x+1=3+3（1-x）；x÷ 48=24÷ 32；x÷ 2.6=2.88÷ 15.6
• 12. When k is what value, the solution of equation (5x-6x) △ 8 = K / 2 + 1 is nonnegative?
• 13. 1 x + y = k, X-Y = 20 (x, y are positive numbers) find the value of K 2, the solution of the equation 5x + 12 = 4A about X is negative, then the value range of a is? 1 Question 1 x + y = k, X-Y = 20 (x, y are positive numbers) to find the value of K In question 2, if the solution of the equation 5x + 12 = 4A of X is negative, then the value range of a?
• 14. When k, the solution of equation 5x-2k = - x + 4 is between 1 and 3
• 15. If the solution of the equation 5x-2m = - 4-x is between 2 and 10, then the value range of M is () A. M ＞ 8b. M ＜ 32c. 8 ＜ m ＜ 32D. M ＜ 8 or m ＞ 32
• 16. The solution of the equation 5x-2m = - 4-x of X satisfies that 2 is less than X and 10 is less than x, and the value range of M is obtained
• 17. If a unit wants to organize a basketball league match, the competition system is a single cycle form (every two teams have a match), and it plans to arrange 10 matches, then the teams participating in the match should have______ ．
• 18. It takes 15 days for Party A to do it, 10 days for Party B to do it, now Party A does it alone for 5 days, then Party A and Party B cooperate to set up Party A to work for X days
• 19. For a task, Party A can do it in 10 days and Party B can do it in 15 days. The two teams can do it in X days
• 20. For a project, team a will do it alone for 10 days and team B will do it alone for 15 days______ Half of the project can be completed in one day