Question

1)0,6(а-2)=0,4(7+а) - 4,62)(5-у)/(у-1)=9/2​

Answer 1

Ответ:

Пошаговое объяснение:

1) 0,6(а-2)=0,4(7+а) - 4,6

 0,6а-1,2=2,8+0,4а - 4,6

  0,6а-0,4а= -1,8 +1,2

   0,2а = -0,6

   а= -0,6: 0,2= -6:2= -3

   а= -3

2)(5-у)/(у-1)=9/2​

9(у-1) = 2(5-у)

9у-9=10-2у

11у=19

у=19/11

у=1  8/11

Answer 2

It looks like you've provided an equation that involves variables (a and у) and some arithmetic operations. Let's solve this step by step:

Equation 1: 0.6(a - 2) = 0.4(7 + a)

Let's simplify this equation:

0.6a - 1.2 = 2.8 + 0.4a

Subtract 0.4a from both sides:

0.2a - 1.2 = 2.8

Add 1.2 to both sides:

0.2a = 4.0

Now divide by 0.2:

a = 20

So, the solution for the variable 'a' is 20.

Equation 2: (4.62)(5 - у)/(у - 1) = 9/2

First, let's simplify the left side of the equation:

(4.62)(5 - у)/(у - 1) = 4.62(5 - у)/(у - 1)

Now let's cross-multiply:

4.62(5 - у) = (у - 1)(9/2)

23.1 - 4.62у = (9/2)у - 9/2

Add 9/2 to both sides:

23.1 - 4.62у + 9/2 = (9/2)у

Combine the constants on the left side:

(23.1 + 9/2) - 4.62у = (9/2)у

Now subtract (9/2)у from both sides:

23.1 + 9/2 - 4.62у - (9/2)у = 0

23.1 + 9/2 - (13.62/2)у = 0

Multiply 13.62/2:

23.1 + 9/2 - 6.81у = 0

Subtract 23.1 + 9/2 from both sides:

-6.81у = -32.2

Now, divide by -6.81:

у = 4.734

So, the solution for the variable 'у' is approximately 4.734.

To recap:

• Solution for 'a': a = 20
• Solution for 'у': у ≈ 4.734