\(M=\dfrac{\dfrac{2}{31}+\dfrac{2}{2007}-0,6}{\dfrac{4}{31}-1,2+\dfrac{4}{2007}}=\dfrac{\dfrac{2}{31}+\dfrac{2}{2007}-\dfrac{6}{10}}{\dfrac{4}{31}-\dfrac{6}{5}+\dfrac{4}{2007}}\)
\(=\dfrac{\dfrac{2}{31}+\dfrac{2}{2007}-\dfrac{6}{10}}{\dfrac{4}{31}+\dfrac{4}{2007}-\dfrac{6}{5}}=\dfrac{\dfrac{2}{31}+\dfrac{2}{2007}-\dfrac{3}{5}}{2\left(\dfrac{2}{31}+\dfrac{2}{2007}-\dfrac{3}{5}\right)}\)
\(=\dfrac{1}{2}\) (Do \(\dfrac{2}{31}+\dfrac{2}{2007}-\dfrac{3}{5}\ne0\))