Question

-3(y+4)+4(2y-1)=0 0,3(5x-7)=3(0,2x+3,2) 4(1,2b+3,7)-2,8=5,2b СРОЧНО!!!

Answer 1

-3(y+4)+4(2y-1)=0

-3y-12+8y-4=0

-3y+8y=0+12+4

5y=16

y=16:5

y=3,2

Ответ:y=3,2

0,3(5x-7)=3(0,2x+3,2)

1,5x-2,1=0,6x+9,6

1,5x-0,6x=9,6+2,1

0,9x=11,7

x=11,7:0,9

x=13

Ответ:x=13

4(1,2b+3,7)-2,8=5,2b

4,8b+14,8-2,8=5,2b

4,8b-5,2b=2,8-14,8

-0,4b=-12

b=-12:(-0,4)

b=30

Ответ:b=30

Answer 2

Ответ:

Пошаговое объяснение:

-3(у+4)+4(2у-1)=0

-3у-12+8у-4=0

5у-16=0

5у=16

у=16÷5

У=3 1/5 или 3,2

0,3(5х-7)=3(0,2х+3,2)

0,3×5х-0,3×7=3×0,2х+3×3,2

1,5х-2,1=0,6х+9,6

1,5Х-0,6Х=9,6+2,1

0,9Х=11,7

Х=11,7÷0,9

Х=13

4×(1,2В+3,7)-2,8=5,2В

4×1,2В+4×3,7-2,8=5,2В

4,8В+14,8-2,8=5,2В

4,8В+12=5,2В

4,8В-5,2В=-12

-0,4В=-12

В=-12÷(-0,4)

В=30

Answer 3

Sure, let's solve these equations step by step. Please note that there are some typos and inconsistencies in the equations you provided. I will correct them where possible.

1. Solve the equation: -3(y+4) + 4(2y-1) = 0

Expand and simplify the equation:

-3y - 12 + 8y - 4 = 0

Combine like terms:

5y - 16 = 0

Add 16 to both sides to isolate the variable term:

5y = 16

Now, divide both sides by 5 to solve for y:

y = 16 / 5

y = 3.2

2. Solve the equation: 3(5x-7) = 3(0.2x+3.2)

Expand and simplify the equation:

15x - 21 = 0.6x + 9.6

Move the variable term to one side and the constant term to the other side:

15x - 0.6x = 9.6 + 21

Combine like terms:

14.4x = 30.6

Now, divide both sides by 14.4 to solve for x:

x = 30.6 / 14.4

x ≈ 2.125

3. Solve the equation: 4(1.2b+3.7) - 2.8 = 5.2b

Expand and simplify the equation:

4 * 1.2b + 4 * 3.7 - 2.8 = 5.2b

4.8b + 14.8 - 2.8 = 5.2b

Combine like terms:

4.8b + 12 = 5.2b

Subtract 4.8b from both sides to isolate the variable term:

12 = 0.4b

Now, divide both sides by 0.4 to solve for b:

b = 12 / 0.4

b = 30

So, the solutions are:

1. y = 3.2
2. x ≈ 2.125
3. b = 30