Question

3) 25 - x: 1,02 = 4,2; 4) 144 : x - 7,6 = 82,4​

Answer 1

Ответ:

3) x = 24,96

4) x = 0,625

Пошаговое объяснение:

3) 25 - x : 1,02 = 4,2

$\displaystyle 25-\frac{x}{1,02} =4,2\\\\\\\frac{x}{1,02} =25-4,2\\\\\\\frac{x}{1,02} =20,8\\\\x=20,8*1,02\\\\\boldsymbol {x = 24,96}$

4) 144 : x - 7,6 = 82,4​

144 : x = 82,4​ + 7,6

144 : x = 90

$\displaystyle x=\frac{90}{144} \\\\\\\boldsymbol {x= \frac{5}{8} =0,625}$

Answer 2

To solve the equations:

3. 25 - x + 1.02 = 4.2

Subtract 1.02 from both sides:

25 - x = 4.2 - 1.02

Simplify:

25 - x = 3.18

Now, subtract 25 from both sides:

-x = 3.18 - 25

Simplify:

-x = -21.82

Finally, multiply both sides by -1 to solve for x:

x = 21.82

Therefore, the solution to the equation is x = 21.82.

4. 144 / x - 7.6 = 82.4

Add 7.6 to both sides:

144 / x = 82.4 + 7.6

Simplify:

144 / x = 90

Now, multiply both sides by x:

144 = 90x

Divide both sides by 90:

144 / 90 = x

Simplify:

x = 1.6

Therefore, the solution to the equation is x = 1.6.