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The proportion of positive and negative in life

1. When walking, the more time you spend, the longer you walk.

When buying apples, the more you pay, the more apples you buy.

3. Farmers grow crops. The more land they plant, the more crops they harvest.

4, meters divided by total price = unit price (certain)

5, the same pork, the more people in the family, the less pork everyone can eat.

6. 100 meter race, the distance is 100 meter, and the total number of people is the same. The number of people in line is the same as the number, speed and time of each line.

7. Make paper boxes, the total number is certain, and the number and number of people per person.

8. When buying things (actually using stationery), the total amount of money is certain, its unit price and quantity.

9. A rectangle has a certain area, length and width.

10, a cuboid has a certain volume and a high bottom area.

1 1, time * speed = distance

12, distance/speed = time

13, distance/time = speed

14, length * width = area

15, area/length = width

16, area/width = length

18, triangle: 1/2ab=s

19、ab=2s

20, 2s/a=b① Fixed time, the number of meters woven per hour and the total number of meters woven.

2 1, the parallelogram has a certain area and its base and height.

22, the numerator is certain, denominator and fractional value.

23. The unit price of a newspaper is fixed, including the total price and the number of subscriptions.

24. The perimeter and side length of a square.

25. The side length and area of a square.

26, a certain distance, the diameter of the wheel and the number of revolutions of the wheel.

27. Do a certain number, a number and a difference.

28. The height, bottom and area of a triangle are certain.

29. A and B are reciprocal, A and B.

30、2s/b=a

3 1, the total number of pages (a certain number) is inversely proportional to the number of pages in each book.

32. The total number of students (a certain number) is inversely proportional to the number of students in each class.

33. Distance is inversely proportional to time and speed.