Then you see the classmate beside you riding faster than you. Have you ever thought about how you judge who is fast and who is slow? Compare distances at the same speed? Or is the same distance faster? Sure, anything will do. ...
When you go to buy breakfast, you find that the price of the bread you eat every day has gone up. You don't have enough money today. You are embarrassed. But have you ever wondered why the price will go up? It turns out that after careful calculation, the boss can get the highest profit by pricing this bread for a few dollars. For example, the owner of a bakery, who has been running the bakery for three months, found that a certain type of bread can be sold at the cost price of 2 yuan and 5 yuan, with 100 pieces per day. If the price is increased by 1 yuan and 5 pieces of bread are sold less, what is the most appropriate price increase for this bread? We can solve it by quadratic function. If the price rises by X yuan, the profit per loaf will be 5+x-2, and you can sell 100-5x pieces every day. According to: total profit = profit per loaf × quantity sold, the function can be listed: y = (3+x) (100-5x); Then, you can find the exact time of X, which is the most profitable.
Do you know which part of the way to school spends the most time today? Draw a plane rectangular coordinate system, the abscissa is time, and the ordinate is the distance from home, which is clear at a glance.
When you are late, you need to register with the person on duty and ask to write down the name of the grade class. In this way, the school will know which class is the latest this week and which class is the latest. This is also a simple statistical problem. I'm just stating a very common thing. Mathematics appears in our field of vision all the time. Circumference, distance formula, quadratic function, equation, plane rectangular coordinate system, statistics, etc.