Respuesta :

Tucon
  
[tex]\displaystyle\\ \frac{6m^4n^4}{12m}= \frac{6m\times m^3n^4}{2\times 6m}= \frac{6m}{6m}\times \frac{m^3n^4}{2}= \boxed{\frac{m^3n^4}{2}}[/tex]