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The edge length of a cube is a and the volume is a
Cube of a
How to judge positive proportion and negative proportion? The best secret!
OK, here are 20!
If the quantity is equal to the division of two related quantities (the relation is in accordance with y △ x = k), then it is in a positive proportion;
If the quantity is equal to the multiplication of two related quantities, then it is inversely proportional
If the multiplication value of two numbers does not change, it is inverse proportion, if the division value does not change, it is positive proportion
How to judge whether it is a positive proportion or an inverse proportion?
How to judge whether XY in a table is positive or negative?
Please answer completely,
The significance of positive proportion: (1) positive proportion: two related quantities, one of which changes, and the other changes with it. If the ratio (quotient) of the two numbers corresponding to the two quantities is fixed, the two quantities are called positive proportional quantities, and their relationship is called positive proportional relationship
Positive proportion and negative proportion
A section of the road, has been the journey and the rest of the journey
Out of proportion
RELATED INFORMATIONS
- 1. How to judge positive proportion and negative proportion
- 2. How do you judge whether the two quantities are in direct proportion or in inverse proportion?
- 3. 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!
- 4. 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
- 5. 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?
- 6. 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?
- 7. 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
- 8. 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
- 9. 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?
- 10. Unit price quantity total price What is the total price equal to? Unit price =? Quantity =? What I want is a formula
- 11. The surface area of a cube is proportional to its edge length. Why
- 12. The surface area of a cube is in direct proportion to its edge length. Why?
- 13. The volume of a cube is not proportional to its surface area Judgment questions It's a judgment question,
- 14. The numerator is proportional to the denominator and the denominator is proportional to the fraction
- 15. If the denominator is fixed, the proportion between the numerator and the fractional value depends on the quantitative relationship
- 16. When are fractional values, numerators, and denominators in positive proportion
- 17. A pile of coal carries 25 tons, which is just five twelfth of the total tons. If it carries 60% of the total tons, how many tons?
- 18. A ton of coal carries 25 tons, which is just five twelfth of the total tons. If it carries 60% of the total tons, how many tons?
- 19. If the engine power is kept unchanged, the speed of the car is v2 What is the maximum speed of the car on the horizontal road with the same amount of power (assuming that the resistance of the car is the same in three cases)?
- 20. 1. On the slope with a sine value of 1 / 10, a car runs with constant power, and the friction resistance is 2 / 10 of the weight of the car. If the speed rate of the car going up the slope at a constant speed is V, what is the speed rate of the car going down the slope at a constant speed? 2. The vehicle accelerates on the horizontal road with constant power and constant resistance. When the speed is V, the acceleration is a, and when the speed is 2V, the acceleration is a / 4, what is the maximum speed of the vehicle?