Question

1) x:4,7=12,3 2) 12,5*x=45 3) 2,45:(2x-1,4)=3,5

Answer 1

Ответ:

Пошаговое объяснение:

1) x:4,7=12,3

  х=12,3*4,7

  х=57,81

Проверка:

57,81:4,7=12,3

12,3=12,3

Ответ: 57,81.

2) 12,5*x=45

   х=45:12,5

   х=3,6

Проверка:

12,5*3,6=45

45=45

Ответ: 3,6.

3) 2,45:(2x-1,4)=3,5

   2х-1,4=2,45:3,5

   2х-1,4=0,7

   2х=0,7+1,4

   2х=2,1

   х=1,05

Проверка:

2,45:(2*1,05-1,4)=3,5

2,45:0,7=3,5

3,5=3,5

Ответ: 1,05.

Answer 2

It looks like you've provided a set of mathematical expressions. Let's break down and solve each of them:

1. x:4,7 = 12,3: This expression appears to be a proportion. To solve for x, you can cross-multiply and solve for x: x * 12.3 = 4.7 * 3

x * 12.3 = 14.1

Now, divide both sides by 12.3 to isolate x: x = 14.1 / 12.3 ≈ 1.1463 (rounded to four decimal places)

2. 12.5 * x = 45: To solve for x in this equation, you need to isolate x by dividing both sides by 12.5: x = 45 / 12.5

x = 3.6

3. 2.45 : (2x - 1.4) = 3.5: This equation involves a division of 2.45 by the quantity (2x - 1.4). To solve for x, first isolate the quantity on the left side by multiplying both sides by (2x - 1.4):

2.45 = 3.5 * (2x - 1.4)

Now, distribute 3.5 on the right side:

2.45 = 7x - 4.9

Add 4.9 to both sides to isolate the term with x:

7x = 2.45 + 4.9 7x = 7.35

Finally, divide both sides by 7 to solve for x:

x = 7.35 / 7 x ≈ 1.05

So, the solutions are:

1. x ≈ 1.1463
2. x = 3.6
3. x ≈ 1.05