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!

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!

(1) It's proportional because the travel speed = distance / time
(2) Because length = area / width
(3) It's not proportional, because the weight eaten = the original weight of the rice - the remaining weight
(4) Because the number of hectares sown per day = the total number of hectares sown / the number of days sown
(5) Because the number of sheets of each exercise book = the total number of sheets of bound exercise books / the number of bound exercise books

Judge whether the two quantities in each question are in proportion, and explain the reason
(1) The speed of the car is fixed, the time and distance of the car
(2) The perimeter and side length of a square
(3) A book, read the number of pages and have not read the number of pages

1. For primary school, distance S = speed V * time t, which is in positive proportion. But for junior high school and above, speed has direction, which is vector; distance has no direction, which is scalar, which is not in positive proportion
2. Square circumference C = 4D (side length), must be in proportion
3. Not in proportion
A positive proportion is y = KX (k is a constant)

Judge whether the two quantities in each of the following questions are in [positive] proportion, and explain the reason!
The unit price of composition book is fixed, total price and subscription quantity
The height of Xiaoxin's high jump and his height
Wheat yield per hectare is fixed, wheat hectare and total yield
The total number of pages of the book is fixed, the number of pages read and the number of pages not read
Judge whether the two quantities in each of the following questions are in inverse proportion, and explain the reason!
A new batch of coal in the school, daily coal consumption and days of use
There is a certain number of students in the class, the number of students in each group and the number of students in each group
The total volume of the book is fixed, and the number of volumes and packages of each package
The area of cucumbers and tomatoes planted on a vegetable field

The unit price of the composition book is fixed, and the total price is proportional to the subscription quantity
The height of Xiaoxin's high jump is out of proportion to his height
The yield of wheat per hectare is fixed, the number of hectare and the total yield of wheat are in positive proportion
The total number of pages of a book is fixed, and the number of pages read is not in proportion to the number of pages not read
Judge whether the two quantities in each of the following questions are in inverse proportion, and explain the reason!
There is a new batch of coal in the school, and the daily coal consumption is inversely proportional to the number of days
The number of students in each group is inversely proportional to the number of students in each group
The total volume of a book is fixed, and the volume of each package is inversely proportional to the number of packages
The area of cucumber and tomato growing on a vegetable field is out of proportion

Judge whether the two quantities in the following questions are in proportion, and explain the reasons
Total price / quantity = unit price (fixed). Because the ratio of total price to quantity is fixed, they are in a positive proportion
1. The length of a rectangle is definite, and its area is equal to its width
2. Quotient, divisor and divisor
3. Certain work efficiency, total amount of work and working time
4. Sum, one addend and another
5. The total number of pages in a book is fixed, the number of pages read and the number of pages not read
6. The side and perimeter of a square
7. The number of copies and total amount of money for subscribing to juvenile literature and art

1. The length of a rectangle is fixed, and the area and width are in a positive proportion. Area / width = length (fixed). Because the ratio of area and width is fixed, they are in a positive proportion
2. Quotient is definite, the divisor and divisor are in positive proportion, the divisor / divisor = quotient (definite), because the ratio of divisor and divisor is definite, they are in positive proportion
3. The work efficiency is constant, the total amount of work is in direct proportion to the working time. A: the total amount of work / working time = the work efficiency (constant). Because the ratio of the total amount of work and working time is constant, they are in direct proportion
A: it's not in a positive proportion, because the ratio of one addend to another is not necessarily. So they are not in a positive proportion
5. The total number of pages of a book is fixed, the number of pages read and the number of pages not read. A: it is not in a positive proportion. Because the ratio of the number of pages read and the number of pages not read is not certain, they are not in a positive proportion
6. Side length and perimeter of a square. A: it is in a positive proportion. Perimeter / side length = 4 (certain). Because the ratio of side length and perimeter of a square is certain, they are in a positive proportion
7. The number of copies and the total amount of money for subscribing to juvenile literature and art. A: it is in a positive proportion. The total amount of money / copies = the unit price of juvenile literature and art (fixed). Because the ratio of copies and the total amount of money is fixed, they are in a positive proportion
Remember to adopt!