Question

15x+45=5x-4. 2,4x-5(0,2+4,2)=0,4x+5,8

Answer 1

Думаю так нужно)))))

Answer 2

Let's solve the equations step by step:

1. Solve the equation 15x + 45 = 5x - 4:

To solve this equation, we need to isolate the variable x on one side of the equation. Here's how we can do it:

First, let's get rid of the constants on both sides of the equation. Subtract 5x from both sides:

15x + 45 - 5x = 5x - 4 - 5x

Simplifying:

10x + 45 = -4

Next, let's get rid of the constant term (45) on the left side by subtracting 45 from both sides:

10x + 45 - 45 = -4 - 45

Simplifying:

10x = -49

Now, to find the value of x, divide both sides by 10:

x = -49 / 10

x = -4.9

So, the solution to the first equation is x = -4.9.

2. Solve the equation 2(4x) - 5(0.2 + 4.2) = 0.4x + 5.8:

Let's simplify this equation step by step:

First, calculate the values inside the parentheses:

0.2 + 4.2 = 4.4

Now, we can rewrite the equation as:

2(4x) - 5(4.4) = 0.4x + 5.8

Next, perform the operations within the parentheses:

2(4x) - 22 = 0.4x + 5.8

Now, let's get rid of the constant term (-22) on the left side by adding 22 to both sides:

2(4x) - 22 + 22 = 0.4x + 5.8 + 22

Simplifying:

2(4x) = 0.4x + 27.8

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

2(4x) = 8x

Now, the equation becomes:

8x = 0.4x + 27.8

To isolate the variable x, subtract 0.4x from both sides:

8x - 0.4x = 0.4x + 27.8 - 0.4x

Simplifying:

7.6x = 27.8

Finally, divide both sides by 7.6 to find the value of x:

x = 27.8 / 7.6

x = 3.65789473684 (rounded to 12 decimal places)

So, the solution to the second equation is approximately x = 3.6579.