(4,2:1,2-1,05)•1,6

To solve the expression \((4,2:1,2-1,05) \cdot 1,6\), we need to clarify the components. Based on standard notation and the placement of commas, it appears that you're using comma as a decimal separator.

Let's break it down step by step.

1. Interpret the values:
   • \(4,2\) represents \(4.2\)
   • \(1,2\) represents \(1.2\)
   • \(1,05\) represents \(1.05\)

So the expression can be interpreted as: \[ (4.2 : 1.2 - 1.05) \cdot 1.6 \]

2. Calculate the division: \[ 4.2 : 1.2 = \frac{4.2}{1.2} = 3.5 \]

3. Perform the subtraction: \[ 3.5 - 1.05 = 2.45 \]

4. Final multiplication: \[ 2.45 \cdot 1.6 = 3.92 \]

Thus, the final result of the expression is: \[ \boxed{3.92} \]