What changes have taken place in the world of mathematics? Illustrate the life of solving mathematics knowledge in junior high school with examples (with or without learning)

1. Triangle stability-making triangle stools

2. Just visually check the height of the tree.

3. Using parabola knowledge to solve the problem of projectile range.

4. Calculate the amount of paint needed for wall painting with the relevant area formula.

5. Calculate the profit of commodities. 6. Use the inequality group to solve the problem of assigning X items to Y individuals, and the selective problem (telephone charges, shopping malls, etc. ) .7. Find the height of buildings or other objects by trigonometric function or triangle similarity.

8. Calculate the deficit by using interest rate.

9. Can cars pass through the arch bridge?

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