Please give me a question on how to find proportions and inverse proportions

1. The area of the circle is proportional to the radius of the circle. （

2. The area of the circle is proportional to the square of the radius of the circle. （

3. The area of the circle is proportional to the square of the circumference of the circle. （

4. The area of the square is proportional to the length of the side. （

5. The circumference of the square is proportional to the length of the sides. （

6. When the area of the rectangle is fixed, the length and width are inversely proportional. (7. When the circumference of the rectangle is fixed, the length and width are inversely proportional.) (8. When the area of the triangle is constant, the bottom is inversely proportional to the height.)

9. When the area of the trapezoidal is fixed, the sum of the upper bottom and the lower bottom is inversely proportional to the height. (10. The circumference of the circle is proportional to the radius of the circle.) （

11. Speed and time are inversely proportional. （

12. The total price is certain, and the unit price is proportional to the quantity. （

Choose a certain distance, and the speed and time are proportional to ( ).

a is proportional b inverse and c is disproportionate.

Pi and circumference are proportional ( ).

a is proportional b inverse and c is disproportionate.

The bottom area is fixed, and the total number of blocks and the number of bricks are proportional to ( ).

a is proportional b inverse and c is disproportionate.

y x = 4, y and x are proportional to ( ).

a is proportional b inverse and c is disproportionate.

That's so much for the time being.

Proportional 1) It takes Zhenzhen 35 minutes to read a 50-page storybook and how many minutes does it take to read 250 pages?

2) Niuniu supermarket**bitter gourd soda, 3 bottles**25 yuan. How much does it cost to buy 9 bottles?

3) 1 liter of black tea with 12 grams of sugar is the best, so how many liters of black tea with 20 grams of sugar is the best?

4) 4 stamps are 44 yuan, 96 yuan can buy how many stamps?

5) The price of 2 jewelry boxes is 80 yuan, how much does it cost to buy 7 pieces?

6) Xiao Ming can get a salary of 112 yuan for 4 hours of work, so how much yuan can he get for 7 hours?

7) 9 packs of potato chips sell for 63 yuan, how much does 4 packs sell?

8) 48 eggs can be packed into 4 boxes, how many boxes can 144 eggs be packed?

9) There are 250 chocolate beans in 5 tubes, how many are there in 4 tubes?

10) How many people can be carried in 2 taxis and 10 people in 16 taxis?

Inverse proportional 1) Xiaohong reads a children's **, reads 12 pages a day, and can read it in 10 days; If you read 15 pages a day, how many days can you read them?

2) If a workshop assembles a batch of TVs, if 50 TVs are installed every day, the task will be completed in 60 days, and if the task is completed in 40 days, how many TVs should be installed per day?

3) Produce a batch of parts, plan to produce 160 pieces per day, it can be completed in 15 days, the actual daily overproduction of 80 pieces, can it be completed a few days in advance?

4) A steamer, sailing 25 kilometers per hour from port A to port B, can reach the destination in 8 hours From port B to port A, sailing 20 kilometers per hour, how many hours can it be reached?

5) If you use 20 cm bricks to pave a piece of land, you need 2000 pieces, if you use 40 cm side bricks to pave the ground, how many pieces do you need?

6) Bring in a batch of paper bound into exercise books, each book is 36 pages, you can order 40 books, if each book is 30 pages, how many copies can be ordered?

7) A house is paved with blocks and paved with 8 square meters of square bricks, it takes 240 pieces, if you use 10 square meters of square bricks instead, how many pieces do you need?

8) It takes 20 cars to transport a pile of coal with a load of 4 tons at one time, and if it is transported by a car with a load of 5 tons, how many cars do it take to transport it?

9) Build a road, 900 meters a day, it can be repaired in 5 days, if you want to repair it in 20 days, how many meters can be repaired every day?

10) Students participate in the work of moving bricks, each person moves 36 pieces, and it takes 5 people to complete the move, according to this calculation, if 9 people go to move, how many pieces do each person move?

Question 1: 3x 9y

x than y (3).

x and y into (positive.

Proportion Question 2: Total Tree Planting: The survival rate of a certain tree and the proportion of the surviving tree (positive) Question 3: Y ratio of 2/2 = 7/x

x and y are not equal to zero).

What relationship? Why?

x,y are inversely proportional. Because: xy=2*7=14 (definitely) if it helps you,. Thank you.

(anti), (positive), (positive).

Total number of words), (number of candies).

positive), (anti) (d).

It is known that a b = c (b≠0), when a is constant, b and c are (inversely) proportional; When b is constant, a and c are (positive) proportional; When c is certain, a and b are (positive) proportional.

When typing with a computer, when the number of words typed per minute is fixed, time is proportional to the total number of words typed; When packing a batch of candy, (when the number of sugars is certain), the number of sugars in each bag is inversely proportional to the number of bags.

If x = 5/y, then x and y are (positive) proportional; If x-6 = 4/y, then x and y are (inversely) proportional.

The equation that indicates that x and y are inversely proportional is (d).

1. The area of the circle is proportional to the radius of the circle. (

2. The area of the circle is proportional to the square of the radius of the circle. 3. The area of the circle is proportional to the square of the circumference of the circle. 4. The area of the square is proportional to the length of the side. (

5. The circumference of the square is proportional to the length of the sides. (

6. When the area of the rectangle is fixed, the length and width are inversely proportional. (7. When the circumference of the rectangle is fixed, the length and width are inversely proportional.) (8. When the area of the triangle is constant, the bottom is inversely proportional to the height.)

9. When the area of the trapezoidal is fixed, the sum of the upper bottom and the lower bottom is inversely proportional to the height. (10. The circumference of the circle is proportional to the radius of the circle.) (

11. Speed and time are inversely proportional. (

12. The total price is certain, and the unit price is proportional to the quantity. Choose a certain distance, and the speed and time are proportional to ( ).

a is proportional b inverse and c is disproportionate.

Pi and circumference are proportional ( ).

a is proportional b inverse and c is disproportionate.

The bottom area is fixed, and the total number of blocks and the number of bricks are proportional to ( ).

a is proportional b inverse and c is disproportionate.

y x = 4, y and x are proportional to ( ).

a is proportional b inverse and c is disproportionate.

1. According to xy=1,。。 x is, y is (2) y is.

16, x is (1 16) x is 100, y is (1 100) y is 1/3, x is (3) 2, determine whether the two quantities of the following individuals are proportional and what is the proportion. The area of the triangle is certain when its base and height. (inversely proportional) a storybook with coconut trees seen and pages unseen.

inversely proportional) to a room with tiles, and the length of each floor is the number of tiles. (inverse proportional).

(1) The number of trees planted by each person is the total number of trees planted in the class.

Proportional (2).

The zhidao area of the triangle is certain, its base and height.

Inverse proportional (3).

From home to school, Ms. Wang's speed and time spent riding a bicycle.

Inverse proportional (4).

A comic book with the number of pages viewed and the number of pages not seen.

Not positive and negative proportions.

5) Buy a certain number of pens, unit price and total price. Genus.

Proportional (6).

The cost of living is certain, the standard of daily living expenses and the number of days required. (inverse proportional).