Laske.

a) [[$ \dfrac{3}{7} \cdot \dfrac{4}{5} $]] =

b) [[$ \dfrac{3}{5} \cdot \dfrac{10}{21} $]] =

c) [[$ 1 \dfrac{3}{4} \cdot \dfrac{2}{7} $]] =

d) [[$ 3 \dfrac{3}{4} \cdot 2 \dfrac{2}{5} $]] =