![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
The total price is fixed, and the quantity is proportional to the unit price______ Proportion
Quantity and unit price are two related quantities. They have the following relationship with the total price: quantity × unit price = total price (fixed); it is known that the total price is fixed, that is, the product of quantity and unit price is fixed, so the quantity and unit price are in inverse proportion
What is the ratio of unit price, quantity and total price? Why
Unit price × quantity = total price
So the unit price is inversely proportional to the quantity, when the total price is fixed
The unit price is directly proportional to the total price when the quantity is fixed, or the quantity is directly proportional to the total price when the unit price is fixed
The unit price is fixed, the total price is proportional to the quantity______ Proportion
Because: total price △ quantity = unit price (certain), so the total price and quantity are in a positive proportion
The total price is fixed, and the ratio between quantity and unit price is ()
Is it positive or negative
The total price is fixed, and the quantity is (inversely) proportional to the unit price
RELATED INFORMATIONS
- 1. Is the total price in proportion to the unit price Most people think that it is in a positive proportion, but in the positive proportion relationship, it says: there are two related quantities, one of which changes with the change of the other. The unit price is not a variable quantity, but the quantity is certain. Can it still be in a positive proportion? In real life, how can the unit price change constantly?
- 2. What is the ratio between unit price and total price and why
- 3. The height of a triangle is fixed. What is the ratio of its area to its bottom?
- 4. Xiaoyue automobile sales company went to an automobile factory to buy two types of cars, a and B, for 3 million yuan Xiaoyue automobile sales company can buy 10 A-type cars and 15 B-type cars with 3 million yuan, and 8 A-type cars and 18 B-type cars with 3 million yuan (1) How many ten thousand yuan each for a and B cars? (2) The car sales company is going to buy 30 cars of a and B models with no more than 3.15 million yuan. How many plans are there? All of them need to be solved by linear inequality of one variable
- 5. The number of cars is 112 more than that of trucks, so the number of trucks is () A. 1+112B. 1÷（1+112）C. （1+112）÷1D. 1-112
- 6. What chart is appropriate to reflect the number of cars and trucks passing through three different sections of a road at an intersection?
- 7. A. The distance between the two places is 360 km. Car a starts from place a and goes to place B for 72 km per hour. 25 minutes after car a starts, car B starts from place B and goes to place a for 48 km per hour. After the two cars meet, they continue to drive in the same direction until their respective destination (1) How long did car B travel from departure to meeting? (2) When the distance between car a and car B is 10 km, how long does car B travel?
- 8. A train from Weihai to Jinan, has been the whole line of 25, there are 360 kilometers from Jinan. How many kilometers from Weihai to Jinan?
- 9. It's 360 kilometers from a to B. a car starts from a at 13:30 and arrives at B at 16:30. How many kilometers does the car travel per hour?
- 10. A plane flies 552km downwind. During the round-trip flight, the plane flies 5.5h downwind and 6h upwind. What is the wind speed of this flight?
- 11. Unit price quantity total price What is the total price equal to? Unit price =? Quantity =? What I want is a formula
- 12. Let the number of rows of seats in the classroom be m, expressed by the formula 1. There are 6 more seats in each row than in the classroom. How many seats are there in the classroom? 2. The number of rows of seats in the classroom is two-thirds of each row. How many seats are there for teachers?
- 13. The number of trees in each row is inversely proportional to the number of rows. The number of boys is inversely proportional to the number of girls
- 14. Sixth grade students line up to do radio exercises. The number of people in each line is proportional to the number of lines______ When the oil yield is constant, the quality of peanut oil is equal to that of peanut______ Proportion
- 15. What's the formula (1) Vega's speed is 14 kilometers per second, which is equivalent to 7 / 13 of Altair's speed. How many kilometers per second is Altair's speed? (2) Vega's speed is 14 kilometers per second, which is equivalent to 6 / 13 of Altair's speed. How many kilometers per second is Altair's speed?
- 16. A model a car is 150000 yuan per car, B model car is 100000 yuan per car, a model a car can make 8 & nbsp; 000 yuan, and a model B car can make 5 & nbsp; 000 yuan. A company bought 30 models a and B cars with 4 million yuan, and the total profit is no less than 204000 yuan after all of them were sold? How many ten thousand yuan are the profits of these schemes?
- 17. Judge whether the two quantities in each question are in proportion, and explain the reason (1) The unit price of the pencil is fixed, the number of pencils to buy and the amount of money to pay (2) The speed of the car is fixed, the driving time is long and the distance is long (3) Perimeter and side length of a square (4) A book, the number of pages read and the number of pages not read
- 18. Judge whether the two quantities of each question are in proportion, and explain the reason (1) The speed of the car is fixed, the distance and the time it takes (2) A rectangle has a certain length, an area and a certain width (3) The weight of a bag of rice must be the weight of the food and the rest (4) The number of hectare sown per day is fixed, the total hectare sown and the number of days sown (5) The number of each exercise book is fixed, the total number of bound exercise books and the number of bound exercise books Remember to explain why!
- 19. How do you judge whether the two quantities are in direct proportion or in inverse proportion?
- 20. How to judge positive proportion and negative proportion