-5,4+1,2 -0,81+(-0,19) -4,8+2,6

Let's calculate each of the expressions step by step.

1. -5,4 + 1,2: \[ -5.4 + 1.2 = -4.2 \]

2. -0,81 + (-0,19): \[ -0.81 - 0.19 = -1.00 \quad \text{(or just -1)} \]

3. -4,8 + 2,6: \[ -4.8 + 2.6 = -2.2 \]

So, the final answers are:

1. \(-4.2\)
2. \(-1\)
3. \(-2.2\)