Question

1) 2,45 : ( 2 х - 1,4 ) = 3,5 2) 21 : ( 4х + 1,6) = 2,5

Answer 1

2х-1,4=0,7
2х=2,1
х=1,05


4х+1,6=8,4
4х=6,8
х=1,7

Answer 2

It looks like you've provided two mathematical equations involving variables. You would like to solve for the variable "x" in each equation. Let's solve them step by step:

Equation 1: 2.45 / (2x - 1.4) = 3.5

To solve for "x" in this equation, follow these steps:

Step 1: Multiply both sides of the equation by (2x - 1.4) to isolate the fraction on the left side. 2.45 = 3.5 * (2x - 1.4)

Step 2: Distribute 3.5 on the right side of the equation. 2.45 = 7x - 4.9

Step 3: Add 4.9 to both sides of the equation to isolate the "x" term. 7.35 = 7x

Step 4: Divide both sides by 7 to solve for "x". x = 7.35 / 7 x ≈ 1.05

So, the solution for the first equation is approximately x = 1.05.

Equation 2: 21 / (4x + 1.6) = 2.5

To solve for "x" in this equation, follow these steps:

Step 1: Multiply both sides of the equation by (4x + 1.6) to isolate the fraction on the left side. 21 = 2.5 * (4x + 1.6)

Step 2: Distribute 2.5 on the right side of the equation. 21 = 10x + 4

Step 3: Subtract 4 from both sides of the equation to isolate the "x" term. 17 = 10x

Step 4: Divide both sides by 10 to solve for "x". x = 17 / 10 x = 1.7

So, the solution for the second equation is x = 1.7.

To summarize:

• Solution for the first equation: x ≈ 1.05
• Solution for the second equation: x = 1.7