1)(2,08-x)•2,8=5,152 2)2,73:(0,18+x)=3,5 3)16-x:4,5=2,6 4)168:x-11,8=68,2

To solve each of these equations, we will follow these steps:

1. Distribute and simplify both sides of the equation.
2. Solve for the variable by isolating it on one side of the equation.

Let's solve each equation one by one:

1. (2.08 - x) • 2.8 = 5.152 First, distribute the 2.8 on the left side: 5.824 - 2.8x = 5.152 Now, isolate x: -2.8x = 5.152 - 5.824 -2.8x = -0.672 x = -0.672 / -2.8 x ≈ 0.24

2. 2.73 / (0.18 + x) = 3.5 First, multiply both sides by (0.18 + x) to get rid of the denominator: 2.73 = 3.5(0.18 + x) 2.73 = 0.63 + 3.5x Now, isolate x: 3.5x = 2.73 - 0.63 3.5x = 2.1 x = 2.1 / 3.5 x = 0.6

3. 16 - x / 4.5 = 2.6 First, multiply both sides by 4.5 to get rid of the denominator: 16 - x = 2.6 * 4.5 16 - x = 11.7 Now, isolate x: -x = 11.7 - 16 -x = -4.3 x = 4.3

4. 168 / x - 11.8 = 68.2 First, add 11.8 to both sides: 168 / x = 68.2 + 11.8 168 / x = 80 Now, isolate x: x = 168 / 80 x = 2.1

Therefore, the solutions to the equations are:

1. x ≈ 0.24
2. x = 0.6
3. x = 4.3
4. x = 2.1