The number of color TV sets purchased by Hongguang Electric Appliance Store is 3 times more than that of refrigerator, 2 sets more than that of refrigerator, and 90 sets of shower, 4.5 times more than that of color TV sets How many color TV sets and refrigerators do you want to buy?

TV number = 90 / 4.5 = 20 refrigerator number = (20-2) / 3 = 6

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1. In order to welcome the activities of home appliances going to the countryside, Xinhua shopping mall sells a certain kind of refrigerator. The purchase price of each refrigerator is 2500 yuan. Market research shows that when the sales price is set at 2900 yuan, an average of 8 refrigerators can be sold every day; when the sales price is reduced by 50 yuan, an average of 4 more refrigerators can be sold every day. (1) how much should the price of each refrigerator be if the shopping mall wants to make the average sales profit of this kind of refrigerator reach 4800 yuan every day ？ How many refrigerators can be sold per day? (2) Is 4800 yuan a day the biggest profit? If not, try to find out the highest profit when the price of each refrigerator is RMB, and what is the highest profit?
2. (2) If the average price of home appliances is: 1500 yuan for each color TV set, 1500 yuan for each refrigerator, 2000 yuan for each refrigerator, 800 yuan for each mobile phone, it is known
3. In response to the national call of "home appliances to the countryside", a refrigerator factory plans to produce 100 refrigerators of a and B models. According to the budget, after all the refrigerators are sold out The profit can be no less than 47500 yuan and no more than 48000 yuan,
4. Market research shows that when the selling price is 2900 yuan, an average of 8 refrigerators can be sold every day; when the selling price is reduced by 50 yuan, an average of 4 more refrigerators can be sold every day; how many yuan should the selling price be reduced to make the average profit of this refrigerator reach 5000 yuan every day?
5. Market research shows that when the selling price is 2900 yuan, an average of 8 refrigerators can be sold every day; when the selling price is reduced by 50 yuan, an average of 4 more refrigerators can be sold every day; how many yuan should the selling price be reduced to make the average profit of this refrigerator reach 5000 yuan every day?
6. The market research shows that when the selling price is 2900 yuan, an average of 8 refrigerators will be sold every day. When the selling price is reduced by 50 yuan, an average of 4 refrigerators will be sold every day. If the selling price is 2700 yuan, how many refrigerators will be sold every day? How many units can be sold in a day at this time? If the selling price is x yuan (x ≤ 2900), how many refrigerators can be sold in one day?
7. Market research shows that when the selling price is 2900 yuan, an average of 8 refrigerators can be sold every day; when the selling price is reduced by 50 yuan, an average of 4 more refrigerators can be sold every day; how many yuan should the selling price be reduced to make the average profit of this refrigerator reach 5000 yuan every day?
8. A supermarket sells a batch of refrigerators with a purchase price of 2500 yuan. When the sales price is set at 3500 yuan, an average of 8 refrigerators are sold every day, and for every 100 yuan reduction in the sales unit price of refrigerators, an average of 2 more refrigerators are sold every day. In order to sell more refrigerators and increase the daily profit by 1000 yuan, what is the daily preferential price?
9. There are two kinds of refrigerators in Xinhua shopping mall. The purchase price of a refrigerator is 2500 yuan. Market research shows that when the sales price is 2900 yuan, it can sell 8 refrigerators per day on average There are two kinds of refrigerators in Xinhua shopping mall. The purchase price of type a refrigerators is 2500 yuan. Market research shows that when the sales price is 2900 yuan, 8 refrigerators can be sold every day on average. When the sales price is reduced by 50 yuan, 4 refrigerators can be sold every day on average. The purchase price of type B refrigerators is 2000 yuan. Market research shows that when the sales price is 2500 yuan, 8 refrigerators can be sold every day on average When the price is reduced by 45 yuan, an average of 4 more refrigerators are sold every day. If the market wants to make the average profit of the two refrigerators reach 5000 yuan every day, what are the prices of the two refrigerators? It's due tomorrow!
10. Market research shows that when the selling price is 2900 yuan, an average of 8 refrigerators can be sold every day; when the selling price is reduced by 50 yuan, an average of 4 more refrigerators can be sold every day; how many yuan should the selling price be reduced to make the average profit of this refrigerator reach 5000 yuan every day?
11. Siping home appliance store has 240 TV sets of various brands, 15 more than refrigerators. How many refrigerators does the store have?
12. The equation is used to calculate the total number of 240 TV sets of various brands in the electric market, which is one fifth more than that of refrigerators?
13. Electric power of household appliances
14. Electric power of air conditioner refrigerator TV incandescent lamp It seems that the weak multiple choice questions are often tested If you have electric power, please also present, thank you Just give me a guess
15. What electrical power is 1200 watts, a refrigerator B incandescent lamp C color TV D wall mounted air conditioner
16. The formula of Ampere force?
17. After learning the knowledge of series and parallel circuit, Xiaowen asked, "what is the way to connect the TV, light, fan and other electrical appliances at home?" "Parallel connection, of course," Xiaoling replied. What phenomena can show that they are parallel connection______ Let's take an example
18. What phenomenon can explain the home TV, lights, fans and other electrical appliances are used in parallel?
19. The rated power of several electrical appliances in Figure 1 is the closest to 1000W () A. Electric fan B. calculator C. TV D. rice cooker
20. When the following household appliances work normally, the electric power is about 1kW () A. Microwave oven B. refrigerator C. electric fan D. TV set