Solve the equation x △ 2-x △ 4 = 32

Solve the equation x △ 2-x △ 4 = 32

x÷2-x÷4=32
0.5x-0.25x=32
0.25x=32
x=32÷0.25
x=128

4. In the past, each TV set sold for 3900 yuan. First, the price was raised by 1 / 10, and then it was reduced by 1 / 10. Now, is the price still 3900 yuan? Why? Today's sales
4. In the past, each TV set sold for 3900 yuan. First, the price was increased by 1 / 10, and then decreased by 1 / 10. Now, is the price still 3900 yuan? Why? How much is the price now?

No, because the price reduction is based on the price increase. The details are as follows:
Original price: 3900;
Price after price increase: 3900 + 3900 * 1 / 10 = 4290;
Price after reduction: 4290 - 4290 * 1 / 10 = 3861

2.5/4 = x / 32

2.5/4=x/32
4x=2.5*32
4x=80
x=80/4
x=20

2. The original price of a TV set is 3200 yuan. First the price is increased by 5%, and then the price is reduced by 5%
C. Equal to

B
It is proved that 3200 x (1 + 5%) = 3360
3360x（1－5％）＝3192
Because 3192 yuan is less than 3200 yuan
So choose B

32: x = 5 / 3: 5 / 4

32: x = 5 / 3: 5 / 4
32：x=4:3
4x=96
x=24

The original price of a TV set is 4000 yuan. After the price is increased by 10%, the price is reduced by 20%. How much is the price of each TV set now?

4000*110%*80%=3520…… Let's go~

X + 3 / 4x = 21 to solve the equation

7x/4 = 21
x = 4/7*21 =12

The original price of a TV set was 3000 yuan. First the price was reduced by 5%, then the price was increased by 5%. Now how much does it cost to buy a TV set?

3000-{(3000*5%)+(3000-3000*5%)*5%}=2709.8

Solving equation 3 (x + 1) (X-2) = 4x

The equation 3 (x + 1) (X-2) = 4x is removed from the brackets, and the terms are shifted to: 3x ^ 2 - 7x - 6 = 0. By cross multiplication and factorization, (x-3) (3x + 2) = 0 is obtained to solve the equation, obviously X1 = 3, X2 = - 2 / 3

The original price of a color TV set is 4000 yuan per set, which is one eighth lower than the original price. How much is the price reduction?

Hello, 4000 * (1 / 8) = 500, a price reduction of 500 yuan. I hope it will help you