5) 22,256:20,8 - 3,52 * 1000

First, divide 22.256 by 20.8:
$$22.256 : 20.8 = 1.07$$
Next, multiply 3.52 by 1000:
$$3.52 * 1000 = 3520$$
Now, subtract 3520 from 1.07:
$$1.07 - 3520 = -3518.93$$

Answer: -3518.93