Practical problems (with formula, 90% of the workers in an enterprise are shareholders, and 80% of the workers are "10000 yuan households". How many% of the "10000 yuan households" in this enterprise are shareholders at least?

70%÷80%=87.5%

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1. The heart rate of a person during exercise is usually related to his age. If a is used to indicate his age and B is used to indicate the maximum number of heart beats per minute that a person can bear during exercise, then B = 0.8 (220-a). (1) under normal circumstances, what is the maximum number of heart beats per minute that a 16-year-old teenager can bear during exercise? (2) When a person of 50 years old exercises, the frequency of 10 second heartbeat is 20 times. Is he in danger? Why?
2. Two practical questions, please answer as soon as possible, thank you 1. A car can save 1.8 liters of gasoline by driving 200 kilometers. According to this calculation, how many liters of gasoline can be saved by driving 1500 kilometers? (using the proportional solution) (the process of solving the equation to be set) 2. The two passenger and freight cars leave each other from the two places. After meeting, the two cars continue to arrive at each other's terminal. They return immediately and meet again on the way. The two meeting places are 3000 meters apart. It is known that the speed of the freight car is two-thirds of the speed of the passenger car. How many meters is the distance between the two places
3. Primary school calculation problems, steps, problem-solving ideas, formula! 2 / 3kg of a certain pesticide diluted with water can be sprayed on 7 / 8 hectares of vegetable land. How many hectares of vegetable land can be sprayed on 1kg of such pesticide?
4. Find the formula steps of this problem Take a 30 cm long rectangular iron sheet, cut out a square iron sheet with a side length of 5 cm on each of the four corners, and weld a long uncovered rectangular iron box with a volume of 1500 cubic cm. Find out the width of the original rectangular iron sheet
5. （-1/4）+5/6+2/3-1/2
6. The diameter of a circular flower bed in the park is 60 meters. What is the area of this flower bed? If a potted flower covers an area of about 1 / 10 square meters, how many thousands of potted flowers should be placed in this flowerbed? (the total number is ten thousand)
7. Several arithmetic problems (Grade 6) a.6/11*17-12*3/11 b.（1+1/2）*（1-1/2）*（1+1/3）*（1-1/3）*...*（1+1/9）*（1-1/9） c.1/27+505/2727+131313/272727+101010/272727 d. Known: 1 / 2-1 / 3 = 1 / 2 * 3, calculated: 1 / 2 * 3 + 1 / 3 * 4 + 1 / 4 * 5 + 1 / 5 * 6 +... + 1 / 19 * 20 Note: (/) stands for fractional line. For example: 505 / 2727 = 2727, numerator 505, (*) stands for multiplication 1 / 2-1 / 3 = 1 / 2 * 3, which means 1 / 2-1 / 3 = 1 / 2 * 3
8. A sixth grade arithmetic problem A city holds a cycling race around the city. The fastest person meets the slowest person 35 minutes after starting. It is known that the slowest person's speed is 5 / 7 of the fastest person. A week around the city is 6 kilometers. What's the speed of each person?
9. Recursive equation simple calculation, application problem, equation problem 27.42-（5.7+4.42） 16.5-0.25×5-7.25 An iron wire can be enclosed into a square with an area of 49 square centimeters. If it is enclosed into a rectangle with a width of 4 centimeters, calculate the area of the rectangle 3×（x-7）=0.6 Plus a practical problem. From place B to place a, the price of a plane is four times that of a train, and the price of a plane ticket is 1050 yuan more expensive than that of a train ticket. How much is the price of a plane ticket and a train ticket? (solution of a series of equations) Ask to answer completely, add unit, see clearly number sign.
10. There are four continuous natural numbers, their product is 11880, find these four numbers
11. Physics calculation, formula, formula, 1. On October 31, 2009, Chongming Bridge on the Yangtze River was officially opened to traffic. The total length of the bridge is about 25000m. A car with a weight of 2.0 times 10 and three times a kilogram takes 1250 seconds from the east to the west of the bridge, and the resistance is 2.0 times 10 and three times a kilogram, Question (1) what is the speed of the car from the east to the west of the bridge? (2) what is the work of the car's gravity? (3) what is the power of the car at this time? 2. The mass of object a is 50 kg. If the rope is pulled by a force F of 100 N, the object will move at a constant speed of 0.1 M / S. (excluding the weight of rope and pulley) (this pulley is a moving pulley) find: (1) the friction force on object a; (2) the length of the rope pulled in 2 minutes (assuming that the rope is long enough) (3) the work done by force F; (4) the power done by force F
12. The mass of the E-bike is 40kg, and the maximum speed is 25km / h. how far can the E-bike pass at the maximum speed of 45 minutes? How many meters per second is the speed? During the driving process, the contact area between each tire and the ground is 0.005 square. When a person with a weight of 40kg sits on the car, the ground pressure is?
13. Physical calculation problems (with process and formula) 4、 Calculation questions (29 questions, 9 points for each question, 30 questions, 10 points, 19 points in total) 1. A brick can bear the maximum pressure of 2x105pa, and the contact area between the brick and the ground is 300 cm2. How much pressure can you stack bricks on this brick? 2. There is a reservoir with a dam height of 120m, and the current water level in the reservoir is 100m. What is the pressure of water on the dam bottom? 3. There is a cube with a side length of 2m. How much pressure does atmospheric pressure exert on the upper surface? 4. The gravity of an object is 10N, and its pull force is 6N in water 1. How buoyant is the object? 2. What is the volume of boiled water? 3. The mass of the object? 4. The density of the object?
14. Please write the formula and procedure A plastic bottle with a volume of 2.5L, how many kilograms can it hold water at most? What about gasoline? (1L = 1dm3)
15. The transport team transported a batch of goods, 25 tons of which were transported in the first time, and 40 tons in the second time. At this time, 110 tons of goods remained to be transported. How many tons are there in total?
16. So please write the formula and process, 1. For a project, Party A and Party B work together for 4 days, and then Party B completes the project alone for 5 days. It is known that Party A completes 1% more than Party B every day? 2. It takes 19.8 hours to travel from city a to city B by train at the beginning of 1998. In 1998, the train speed was increased by 30% for the first time, 25% for the second time in 1999, and 20% for the third time in 2000. After these three increases, how many hours does it take to travel from city a to city B by train? 3. Car a can travel 20 kilometers per hour, car B can travel 30 kilometers per hour. After the two cars leave city a at the same time, how long is the distance between them at least 100 kilometers? How many hours at most? 4. There used to be two piles of coal in the boiler room of the school, weighing 24 tons in total. Now we add 4 tons to the small pile of coal and use 1 / 4 from the pile of coal. The weight of the two piles of coal is exactly the same. How many tons of the two piles of coal should we calculate?
17. Mathematics fifth grade score formula, application problems 1、 Use the recursive equation: 1. 5 / 8 - 1 / 3 + 2 / 9, 2. 3 / 20 - (7 / 8 - 17 / 20) 2、 Five out of seven known
18. OK, I'll add a lot of points! 1. There are 270 books on the two bookshelves. Now put 1 / 6 of the books on the first bookshelf into the second bookshelf. At this time, the ratio of books on the two bookshelves is 5:4. How many books are there on each bookshelf? 2. The area ratio of the front, upper and left sides of a cuboid is 7:3:2. It is known that the upper area is 50 square centimeters. What is the surface area of the cuboid?
19. Practical questions (formulas and answers) 1. 36 workers, each of whom can process 10 class a parts or 16 class B parts every day. Two class B parts and one class a part form a set. How many people should be arranged to process class a parts and class B parts respectively every day, so that the two parts can be fully matched 2. The sea route from a to B is nearly 40 kilometers than the highway. At 10 a.m., a ship sails from a coastal road to B, and at 1 p.m., a car also sails from a to B along the highway, and arrives at the same time. The ship is 24 kilometers per hour, and the car is 40 kilometers per hour. How long is the highway from a to B
20. If a batch of apples are distributed to the children in two classes, each of them will get 6 apples on average. If they are only distributed to the children in the big class, each of them will get 10 apples on average. If they are only distributed to the children in the small class, how many apples can each of them get?