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How to solve the engineering problem of linear equation of one variable, encounter problem and so on? In the first semester of junior high school, I taught the linear equation of one variable in mathematics. When I encounter problems like this, I can't find the equivalent relation. What should I do? It's better to send all kinds of formulas of various problems in the second semester of junior high school,
First, find the equation multiple × multiple = several times several times △ 1 multiple = multiple several times △ multiple = 1 multiple speed × time = distance distance △ speed = time distance △ time = speed unit price × quantity = total price △ unit price = quantity total price △ quantity = unit price work efficiency × work time =
Solving linear equation with one variable
A and B practice running on the circular track. It is known that the length of the circular track is 400m, B runs 6m per second, and a runs 8m per second. If a is 8m in front of B, and they start in the same direction at the same time, how many seconds will it take for them to meet for the first time?
Suppose the first encounter occurs after x seconds
8x=6x+400-8
X = 196
How to solve the one variable linear equation in grade one of junior high school
The profit of a commodity is the difference between the selling price and the purchase price of the commodity, that is: the profit of the commodity = the selling price - the purchase price of the commodity. The profit margin of the commodity = the profit margin of the commodity △ the purchase price of the commodity. (1) the purchase price of a certain sports shoe is 250 yuan, and the profit margin is 15.2% when the price is 10% off
Elementary equation of first degree with one variable and practical problems
5. When the speed from a to B is known to be 40 km |, if the average speed of one round trip is 48 km |, the speed from B to a can be calculated
Let the distance between the two places be s, and the velocity from tunnel B to a be X. then the total time is s / 40 + S / x, and the average velocity is 2S / (s / 40 + S / x) = 48. In the equation, s divides 2 / (1 / 40 + 1 / x) = 48, leaving x to solve the equation
RELATED INFORMATIONS
- 1. The problem of "practically solving the equation of one variable and one degree" in grade one of junior high school A shopping mall sells two goods at 99 yuan. One loses 10% and the other makes 10% profit. Is it a loss or a profit for the total price of two goods
- 2. The problem of linear equation with one variable on the first day of junior high school··· When a bicycle is moving at a fixed speed in front of it, there is a car to catch up with. If the speed is 30km / h, it will catch up in one hour; if the speed is 35km / h, it will catch up in 40 minutes to find the bicycle speed
- 3. A store bought 100 a-clock products and 80 B-type products from the wholesale Department of a company. The total cost was 2800 yuan. When the store retailed, the price of each A-type product was increased by 15%, and that of each B-type product was increased by 10%. After all the products were sold, the total income was 3140 yuan. How much was the purchase price of a and B-type products?
- 4. The total cost of two pieces of clothing is 500 yuan. In order to make a profit, the store owner decides to price the clothing at 50% of the profit and the clothing at 40% of the profit. In actual sales, at the request of customers, the two pieces of clothing are sold at a 10% discount. In this way, the store makes a total profit of 157 yuan. How much is the cost of the two pieces of clothing?
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