Respuesta:
M = [tex]\frac{12}{6} +\frac{3}{6}[/tex] / [tex]\frac{6}{3}+\frac{12}{6}[/tex]
M = [tex]\frac{15}{6}[/tex] / [tex]\frac{8}{3}[/tex]
M = [tex]\frac{15}{16}[/tex]
