![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
Xiao Lei bought 4 batteries, paid 10 yuan, and recovered 0.4 yuan. How much is the price of each battery? (solved by equation)
Let every section be x yuan
4*x+0.4=10
The solution is x = 2.4
1. Suppose that the price of an apple is x yuan per kilogram, and someone buys 3 kilograms, pays 10 yuan, and finds 2.5 yuan. Please list the equation containing X and find the solution of the equation. 2, Try to find the value of X. solve the equation (1) 2-0.2y = 3 + 0.3y (2) 5-3 (x-1 / 3) = 4 / 3 (Ps
1.10-3x = 2.5, the solution is x = 2.5 --- 2.5 yuan per kilogram
2. (3 / 4Y + 12) + (5 / 3y-1-2) = 0, y = - 6 is substituted into 3 / 4Y + 120 = 124.5 (calculation may be wrong)
3. X / 7 + 3 / 4 = 0, x = - 21 / 4 or x = 21 / 4 if the question is negative 3 / 4
4.y=-2 x=14/9
Xiao Hong bought a No. 5 battery, paid 3 yuan, and recovered 0.4 yuan. How much is each No. 5 battery? (use equation solution)
Set the price of the battery as X:
X+0.4＝3
X＝3-0.4
X = 2.6 yuan
RELATED INFORMATIONS
- 1. A bear X Yuan, Xiaoqing paid 100 yuan, found 32 yuan, set up equations and solve equations
- 2. If a commodity is sold at 60 yuan, the profit will be 25%. If the purchase price of the commodity is x yuan, the equation can be listed
- 3. 45,8 is 2.65 less than 5.1 times of a certain number
- 4. 20% of 120 is 8 more than 4 / 5 of a number
- 5. 12 times of a number is equal to 50% of 96. What's the number? 3 / 4 of the difference between 8 times of a number and 5 times of it
- 6. The sum of 8 times of a number and 2 times of this number is 12.5
- 7. Solution equation: 5 (x + 8) = 36)
- 8. Solve the equation: 2 * 1 / 10 + 1 / 12 x + 2 (1 / 10 + 1 / 12 + 1 / 15) = 1 to find X
- 9. Given that the solution of the equation x / 0.8 = 4 is the same as that of the equation m + x = 20, can you write another equation with the same solution as the two equations?
- 10. Six bags of rice were delivered from the canteen, each bag is 50kg. After eating for four days, there are still 116kg left. How many kg do you eat per day on average
- 11. If both sides of equation 2 (x-1) = 3 (x-1) are divided by X-1, then 2 = 3. What is the reason for the error I hope I can make it clear soon. Thank you
- 12. (1) X ^ 2-2 root sign 3 times x = 0 (2) 3x ^ 2-6x = 3 (3) 3x (x-2x) = 3 (4) 3x ^ 2-6x-3 = 0 (5) 4x ^ 2-121 = 0
- 13. There is a thin-walled cylindrical container with a mass of 1 kg and a bottom area of 1 × 10-2 M2 on the horizontal ground. The container contains water with a mass of 4 kg. ① calculate the volume of water v. ② calculate the pressure of the container on the ground P. ③ now immerse a block in water, and the water does not overflow. If the increase of the pressure of the container on the ground is equal to the increase of the pressure of the water on the bottom of the container, the density of the block is___ Kg / m3
- 14. Teach an equation and explain why Congcong said, "I've done 2.5 times as many mental arithmetic problems as Fangfang." Fangfang said, "if I do 18 more problems, I'll do as much as Congcong does." how many problems did they do?
- 15. What is the meaning of two identical real roots in the mathematical equation of grade three
- 16. It is known that the equation 9 ^ x-4 × 3 ^ x-a = 0 about X has a real root, so we can find the value range of A
- 17. The equation X-2 (root sign x) - A-1 = 0, has real roots in X ∈ (0,9), and finds the range of A
- 18. Let x = 8 be the solution of the equation 3x-2 = x / 4 + 2a, and let a be the solution of the equation A-1 / 3 [A-1 / 3 (a-b)] = 1 / 9 (a + b)
- 19. How to solve the equation 42 + 3 times x = 69
- 20. Exponential equation 7 * 3 ^ (x + 1) - 5 ^ (x + 2) = 3 ^ (x + 4) - 5 ^ (x + 3) Have a detailed process, mainly tell me how each step comes out. Don't just give me an answer