When an aircraft flies between the two cities, the wind speed is 24 km / h, it takes 2 hours and 50 minutes to fly against the wind, and it takes 3 hours to fly against the wind to calculate the speed of the aircraft when there is no wind

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• 1. We need to solve the linear equation with one variable For a three digit number, a hundred digit number is 4 times smaller than a single digit number, and a ten digit number is 1 times larger than the sum of a single digit number and a hundred digit number. The value of the three digit number is just 25 times that of the ten digit number
• 2. If a round table can be made of 5 cubic meters of wood, then the table can be made of 1 cubic meter of wood and 5 legs For example, please list the equation of one dollar
• 3. A student desk consists of a desk top and four legs. If one cubic meter of wood can produce 50 desks or 300 legs, there are 15 cubic meters of wood, Make them match (equation of first degree with one variable)
• 4. A student desk consists of one desk top and four legs. If one cubic meter can make 50 desks or 300 legs, there are 15 cubic meters of wood, Please design how much wood to use for the table top and how much wood to use for the table legs
• 5. A student desk consists of a desk top and four legs. If one cubic meter of wood can make 50 desks or 300 legs, there are 15 cubic meters of wood A student desk is composed of a desk top and four legs. If one cubic meter of wood can make 50 desks or 300 legs, and there are 15 cubic meters of wood, please design how much wood to use for the desk top and how much wood to use for the legs?
• 6. Use a 2-meter-long wood, saw into four pieces of the same length, used to make stool legs, the height of the stool is about______ Decimeter
• 7. There are three legged chairs and four legged chairs in the classroom. It is known that there are 60 chair legs and 15 chairs, How many are the three legged chair and the four legged chair?
• 8. There are several stools and chairs in the room. Each stool has three legs and each chair has four legs. When they are all sat on, there are 43 legs, including two for each person Leg, how many people are there in the room
• 9. There are several three legged stools and four legged chairs, and they are all manned. If there are 39 legs, how many people are there?
• 10. The general steps of solving practical problems with equations Be brief (no more than 27 words)
• 11. Several primary school mathematics application problems, help to solve 1. The length of a wall clock's hand is 20 cm. How many cm does the tip of the hand walk in a day and night? 2. The diameter of a round flower bed is 3 meters. A circle of railings is set 0.8 meters away from the flower bed. How many meters is the total length of the railings? 3. The circumference of a piece of square paper is 20 decimeters. Cut it into the largest circle. How many decimeters is the circumference of this circle? 4. The express train from a to B runs in 8 hours, and the local train from B to a runs in 12 hours. The two trains run from a and B at the same time. On the way, the two trains meet and continue to move forward. After 6 hours, the distance between the two trains is 90 kilometers. How many meters is the distance between a and B? Want arithmetic solution, don't equation solution, also want to explain, trouble, online, etc., will add reward, hurry up
• 12. Use a simple method to calculate the scores of the following questions Two nines minus seven sixteen times two nines Two fifths by four times three fourths One half by one-fifth plus one-third by one-half Four fifths by seven ninths by five eighties Five sixths by five nines plus five nines by one sixth Five out of seven by sixteen by twenty-one out of five
• 13. Asking for help: two practical problems in sixth grade mathematics of primary school The first topic is: There are 18 spiders, dragonflies and cicadas, with 118 legs and 20 pairs of wings. It is known that spiders have 8 legs, dragonflies have 6 legs and 2 pairs of wings, and cicadas have 6 legs and 1 pair of wings?
• 14. Xishan primary school is going to build a multi-functional classroom. It needs 1600 pieces of wood floor with a length of 50 cm, a width of 10 cm and a thickness of 3 cm to lay the floor. How large is the area of this multi-functional classroom? How many cubic meters of wood should be used to lay the floor? Pour 12 cubic decimeters of water into a 3-decimeter-long, 2-decimeter-wide and 4-decimeter-high rectangular glass tank. How many decimeters is the distance between the water surface and the tank mouth?
• 15. Deposit 200 yuan in the bank for one year. If the annual interest rate is 2.25%, how many yuan can be withdrawn when it matures? (tax deduction) Deposit 800 yuan in the bank for 2 years with an annual interest rate of 2.43%. How much interest tax should be paid when it matures? How much of the principal and after tax interest can be withdrawn when it matures?
• 16. Don't use equations to solve every problem~ one (1) The original price of water for residents in a city is 1.5 yuan per cubic meter, which has been increased by 20%. How much is the price per cubic meter after the price increase? (2) After a 20% increase in the price of water for residents in a city, the price per cubic meter is 1.8 yuan. What is the price per cubic meter before the price increase? 2. At the time of the fifth census, the population of the mainland of China was about 1.27 billion, of which the Han nationality accounted for 91.6%. How many billion ethnic minorities are there in the mainland of China? 3. Brass is an alloy of copper and zinc, in which the content of copper is 68%. A piece of brass contains 16 kg of zinc. How many kg does this brass weigh?
• 17. The school library has purchased three kinds of books, among which the number of story books accounts for 1 / 3 of the total number, 150 comic books, and the ratio of the number of science and technology books to the total number of the other two books is 1:5. How many of the three kinds of books have been purchased?
• 18. The total length of a railway bridge is 1200 meters, and it takes 75 seconds for a train to cross the bridge; it takes only 15 seconds for a train to cross the roadside poles, so the total length of the train is 1200 meters______ Rice
• 19. It takes 55 seconds for a train to cross the 890 meter bridge It takes 45 seconds to cross the 690 meter tunnel at the same speed. How long is the train?
• 20. It takes 40 seconds for a train to cross the 530 meter cave and 30 seconds for a train to cross the 380 meter bridge at the same speed What's the speed of this train? How long is its body?