Question

1) х /8=4 /2 2) 7.8 / х = 7.2 /1.2 3) 2 2.7 / 1 1.7 = х /2 1.9 4) 5 / 4 = 2.5 / х

Answer 1

Ответ: / - это дробная черта)) ↓↓↓

1) х:8=4:2

  х:8=2

х=8*2

 х=16

________ проверка:↓↓↓

16:8=4:2

  2=2

2) 7.8 : х = 7.2 : 1.2

  7.8 : х = 6

  х = 7.8 : 6

     х=1,3

_______________ проверка: ↓↓↓

7.8 : 1,3 = 7.2 : 1.2

        6=6

3)  2 2/7:  1 1/7 = х : 2 1/9

      х : 2 1/9=2

   х= 2 1/9*2

   х= 4 2/9

___________________ проверка: ↓↓↓

2 2/7:  1 1/7 = 4 2/9 : 2 1/9

              2=2

4) 5 : 4 = 2.5 : х

  2.5 : х = 1,25

 х= 2.5 :1,25

     х=2

Пошаговое объяснение: удачи в учёбе!

Answer 2

1. To solve the equation (1), we can cross multiply:

x / 8 = 4 / 2

Cross-multiplying gives us:

2x = 8 * 4

2x = 32

Dividing both sides of the equation by 2:

x = 16

Therefore, the solution to equation (1) is x = 16.

2. For equation (2), we can cross multiply again:

7.8 / x = 7.2 / 1.2

Cross-multiplying gives us:

7.8 * 1.2 = 7.2 * x

9.36 = 7.2x

Dividing both sides of the equation by 7.2:

x = 9.36 / 7.2

x ≈ 1.3

So, the approximate solution to equation (2) is x ≈ 1.3.

3. Let's solve equation (3) by cross multiplying:

2 * 2.7 / (1 * 1.7) = x / (2 * 1.9)

Cross-multiplying gives us:

(2 * 2.7) * (2 * 1.9) = (1 * 1.7) * x

10.8 = 1.7x

Dividing both sides of the equation by 1.7:

x = 10.8 / 1.7

x ≈ 6.35

So, the approximate solution to equation (3) is x ≈ 6.35.

4. Finally, let's solve equation (4) by cross multiplying:

5 / 4 = 2.5 / x

Cross-multiplying gives us:

5 * x = 4 * 2.5

5x = 10

Dividing both sides of the equation by 5:

x = 10 / 5

x = 2

Therefore, the solution to equation (4) is x = 2.