Solve the equation, 4x + 8x = 144, 6y-3y = 159, 13x-58 = 111

Solve the equation, 4x + 8x = 144, 6y-3y = 159, 13x-58 = 111

4x+8x=144
12x=144
x=144÷12
x=12
6y-3y=159
3y=159
y=159÷3
y=53
13x-58=111
13x=111+58
13x=169
x=169÷13
x=13

If customers buy a 3500 yuan refrigerator, how much money can they save?

3500 × (1-85%) = 3500 × 15% = 525 yuan a: 525 yuan can be saved

Solution equation: X-1 / 3x = 58

x-1/3x=58
2/3x=58
1/3x=29
x=29*3
x=87

The refrigerators in the electric appliance stores are on sale, and the price is reduced by 12%. On this basis, the stores return the price by 5%,
How much is the price reduction?

The refrigerators in the electrical appliance stores carry out promotional activities, and the price is reduced by 12%. On this basis, the stores return 5% of the price. At this time, buying a refrigerator is equivalent to 12% + (1-12%) * 5% = 16.4% of the price reduction

How to solve the equation: 4 * (25-x) - 2x = 58?

100--4x--2x=58 --6x=--42 x=7

Home appliance stores have to deal with a refrigerator. If they sell it at a 10% discount, they can still make a profit of 70 yuan. If they reduce the price by 25%, they will lose 110 yuan. How much is the original price of this refrigerator? If you want to break even, how much should you sell?

(70 + 110) / [90% - (1-25%)] = 480 ^ [90% - 75%] = 480 ^ 15% = 3200 (yuan) 3200 × 90% - 70 = 2880-70 = 2810 (yuan) a: the original price of this refrigerator is 3200 yuan. If you want to keep the cost, you should sell it for 2810 yuan

Judge that right or wrong x = 3 is the solution of equation 4x = 12

Judgment result: correct

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

(100-4x) △ 2 = 8, solve the equation and test?

100-4x=16
4x=84
x=21
Inspection:
Left = (100-4 × 21) △ 2 = 8 = right

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