4,03-2,5 2,2•1,4 5,2:2,6 1,2+(1,05-0,4•1,5)

Let's calculate each expression step by step.

1. 4.03 - 2.5 \[ 4.03 - 2.5 = 1.53 \]

2. 2.2 • 1.4 \[ 2.2 \times 1.4 = 3.08 \]

3. 5.2 : 2.6 (which is the same as 5.2 divided by 2.6) \[ 5.2 \div 2.6 = 2 \]

4. 1.2 + (1.05 - 0.4 • 1.5)

   • First calculate \(0.4 \times 1.5\): \[ 0.4 \times 1.5 = 0.6 \]
   • Now substitute this back into the expression: \[ 1.05 - 0.6 = 0.45 \]
   • Finally add \(1.2\): \[ 1.2 + 0.45 = 1.65 \]

Summary of Results:

1. \(4.03 - 2.5 = 1.53\)
2. \(2.2 \times 1.4 = 3.08\)
3. \(5.2 \div 2.6 = 2\)
4. \(1.2 + (1.05 - 0.4 \times 1.5) = 1.65\)

If you need any further calculations or assistance, feel free to ask!