Question

3x-5(12-6x)=-8,5 -12-2,3*(6,5-7x)=13,2 8*(2x-5)=12,3x-68 СРОЧНО!!!!!

Answer 1

3x-5(12-6x)=-8,5

3х-60+30х=-8,5

33х=-8,5+60

33х=51,5

х=51 1/2:33=103/2*1/33=1 37/66

-12-2,3*(6,5-7x)=13,2

-12-14,95+16,1х=13,2

16,1х=40,15

х=40,15:16,1= 40 15/100:16 1/10=(4015*10)/100*161=4015/1610=2 795/1610=2 159/322

8*(2x-5)=12,3x-68

16х-40=12,3х-68

3,7х=-28

х=-28:3 7/10=-28*10/37=-280/37=-7 21/37

Answer 2

To solve these equations, follow these steps:

1. Solve the first equation: 3x - 5(12 - 6x) = -8.5
2. Solve the second equation: -12 - 2.3 * (6.5 - 7x) = 13.2
3. Solve the third equation: 8 * (2x - 5) = 12.3x - 68

Let's go through each equation one by one:

1. 3x - 5(12 - 6x) = -8.5

Expand the brackets: 3x - 5 * 12 + 5 * 6x = -8.5

Simplify the equation: 3x - 60 + 30x = -8.5

Combine like terms: 33x - 60 = -8.5

Add 60 to both sides: 33x = -8.5 + 60 33x = 51.5

Divide by 33: x = 51.5 / 33 x ≈ 1.56

2. -12 - 2.3 * (6.5 - 7x) = 13.2

Expand the brackets: -12 - 2.3 * 6.5 + 2.3 * 7x = 13.2

Simplify the equation: -12 - 14.95 + 16.1x = 13.2

Combine like terms: 16.1x - 26.95 = 13.2

Add 26.95 to both sides: 16.1x = 13.2 + 26.95 16.1x = 40.15

Divide by 16.1: x = 40.15 / 16.1 x ≈ 2.495

3. 8 * (2x - 5) = 12.3x - 68

Expand the brackets: 16x - 40 = 12.3x - 68

Move all x terms to one side and constants to the other side: 16x - 12.3x = -68 + 40

Combine like terms: 3.7x = -28

Divide by 3.7: x = -28 / 3.7 x ≈ -7.57

So, the solutions to the three equations are:

1. x ≈ 1.56
2. x ≈ 2.495
3. x ≈ -7.57