Laske.

a) [[$ \dfrac{5}{a} \cdot \dfrac{2}{3} $]] =

b) [[$ \dfrac{8}{a} \cdot \dfrac{a}{2} $]] =

c) [[$ \dfrac{2b}{8} \cdot \dfrac{5}{b} $]] =

d) [[$ \dfrac{3}{5} \cdot \dfrac{b}{2b} $]] =