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Mathematical positive and negative proportional quantity
1, the latter term of the ratio is certain, and the former term is proportional to the ratio. ( √ )

2. The volume of the cone is constant, and the area of the bottom is inversely proportional to the height. (√ )

3. Reading a book, the number of pages read every day is inversely proportional to the number of days needed. (√ )

4. The total amount of work is directly proportional to the work efficiency. (√ )

5.x×5=y(y≠0), and x and y are in direct proportion. (√ )

6. The diameter of a circle is proportional to the length of a week. ( √ )

7. The total tonnage of goods is fixed, and the tonnage shipped out is inversely proportional to the remaining tonnage. (√ )

8. The circumference of a rectangle is fixed, and its length and width are inversely proportional. ( √ )

9. The number of students' weekly subscriptions is in direct proportion to the amount paid. ( √ )

10, people's height and weight are directly proportional. ( √ )