Laske.

a) [[$10 - 2 \cdot(9 - 3 \cdot 2) +2$]] =

b) [[$ \dfrac{2- (7 -2 \cdot 4)}{-2} $]] =

c) [[$ 5 + \dfrac{(4 - 8) \cdot 2}{4} $]] =

d) [[$ 6 -(2-(3+1)+4)$]] =