Question

-20,5+(-7,5)+20 1/2+(-2,5)+6

Answer 1

=-20,5-7,5+10-2,5+6=-14,5

Answer 2

$20 \frac{1}{2} = 20.5$
$- 20.5 - 7.5 + 20.5 - 2.5 + 6 = \\ = - 7.5 - 2.5 + 6 = - 10 + 6 = \\ = - 4$