Laske.

a) [[$3-|4-2\cdot6|$]] =

b) [[$\left|1-3\cdot \dfrac{4}{7} \right| - \left| 3-4\cdot \dfrac{3}{4} \right|$]] =

c) [[$-2 \cdot |2-4|\cdot |3-(-2-5)|$]] =