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Test of solution equation: 100-4x-50 = 40 (327-x-49) / 8 = 23
①60－4x＝40
4x＝60－40
4x＝20
x＝5
② 327－x－49＝23×8
278－x＝184
x＝278－184
x＝94
The original price of a refrigerator is 1800 yuan, but now it is sold at a 20% price reduction. Each refrigerator still has a profit margin of 25%. If a shopping mall sells 10 such refrigerators, how much will it make?
1800 × (1-20%) = 1800 × 80%, = 1440 (yuan); [1440-1440 ^ (1 + 25%)] × 10 = [1440-1440 ^ 125%] × 10, = [1440-1152] × 10, = 288 × 10, = 2880 (yuan); a: 2880 yuan can be gained
2.4x + 2.4 = 6.8-2x solve the equation and test it. Can you
New year's day shopping malls all goods 70% off promotion, an electrical appliance can now spend 600 yuan less, how much is the original price
If a * (1-0.7) = 600, the original price a = 2000 yuan
Solution equation: 4x - (5-2x) = 18
4x-(5-2x)=18
4x-5+2x=18
6x-5=18
6x=18+5
6x=23
x=23/6
In a new year's day shopping mall, the original price of a suit of clothes is 200 yuan, and the current price is 160 yuan. The current price is several percent lower than the original price
By 20 percent,
Business is sold at a 20% discount!
200 * 0.8 = 160 yuan
Solve the equation 20% (x-1) = 4x%
20%(x-1)=4x%
0.2x - 0.2 = 0.04x
0.16x = 0.2
x = 1.25
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In the activity of home appliances going to the countryside, the original price of a brand refrigerator was 2400 yuan, but now the price is reduced by 20%. How much is it now?
1920=2400-2400X20%
The equation is solved by addition subtraction elimination method: 1-0.3 (Y-2) = (x + 1) / 5 (Y-1) / 4 = (4x-3) / 20-0.4 (2)
Use the addition and subtraction elimination method to solve the equation!
It is reduced to 0.2x + 0.3y = 1.4
0.2x-0.25y=0.3 ②
① 55Y = 1.1
x=4,y=2
The price of type a refrigerator sold in shopping malls is 2190 yuan per unit, and the daily power consumption is 1 degree, while the price of type B energy-saving refrigerator is 10% higher than that of type a refrigerator, but the daily power consumption is 0.55 degree? (calculated according to the service life of 10 years, 365 days per year and 0.40 yuan per kilowatt hour)
If a supermarket sells a refrigerator at a discount of X, it will be cost-effective for consumers to buy it. According to the question, it is 2190 × 10 + 365 × 10 × 1 × 0.4 ≤ 2190 × (1 + 10%) + 365 × 10 × 0.55 × 0.4, that is 219x + 1460 ≤ 2409 + 803. Solving this inequality, it is cost-effective for consumers to buy a refrigerator at least at a discount of 20%
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