Question

(720 : Х - 2) + 40 = 128 (4 х Х + 20) + 720 = 900 (Х х 5 + 25 ) - 415 = 60900 - (4 х Х - 60) = 360 ( 42 : Х - 7 ) х 30 = 420​

Answer 1

Ответ:

$\frac{720}{x } - 2+ 40 = 128 \\ \frac{720}{x -} = 90 \\ x = 8$

$4x + 20 + 720 = 900 \\ 4x = 160 \\ x = 160 \div 4 = 40$

$900 - 4x + 60 = 360 \\ 4x = 600 \\ x = 150$

$5x + 25 - 415 = 60 \\ 5x = 450 \\ x = 90$

$( \frac{42}{x} - 7)30 = 420 \\ \frac{42}{x} = 14 + 7 \\ x = \frac{42}{21} = 2$

Answer 2

Решение и ответы на фото

Answer 3

Let's solve each equation step by step:

1. (720 / X - 2) + 40 = 128

First, isolate the fraction term:

(720 / X - 2) = 128 - 40 (720 / X - 2) = 88

Now, add 2 to both sides:

720 / X = 88 + 2 720 / X = 90

To isolate X, divide both sides by 90:

X = 720 / 90 X = 8

2. (4 * X + 20) + 720 = 900

First, simplify the left side by combining like terms:

4X + 20 + 720 = 900

Subtract 720 from both sides:

4X + 20 = 900 - 720 4X + 20 = 180

Now, subtract 20 from both sides:

4X = 180 - 20 4X = 160

Finally, divide both sides by 4 to isolate X:

X = 160 / 4 X = 40

3. (X * 5 + 25) - 415 = 60900

First, simplify the left side by combining like terms:

5X + 25 - 415 = 60900

Now, subtract 25 from both sides:

5X - 415 = 60900

Add 415 to both sides:

5X = 60900 + 415 5X = 61315

Finally, divide both sides by 5 to isolate X:

X = 61315 / 5 X = 12263

4. 60900 - (4 * X - 60) = 360

First, simplify the right side by distributing the negative sign:

60900 - 4X + 60 = 360

Now, combine like terms:

60960 - 4X = 360

Subtract 60960 from both sides:

-4X = 360 - 60960 -4X = -60560

Finally, divide both sides by -4 to isolate X:

X = -60560 / -4 X = 15140

5. (42 / X - 7) * 30 = 420

First, divide both sides by 30 to isolate the fraction:

42 / X - 7 = 420 / 30 42 / X - 7 = 14

Add 7 to both sides:

42 / X = 14 + 7 42 / X = 21

Now, invert both sides of the equation to solve for X:

X / 42 = 1 / 21

Multiply both sides by 42:

X = (42 * 1) / 21 X = 42 / 21 X = 2

So, the solutions for the equations are:

1. X = 8
2. X = 40
3. X = 12263
4. X = 15140
5. X = 2