Respuesta:
[tex] \frac{2}{4} - \frac{6}{6} = \frac{1}{2} - \frac{2}{2} = \frac{1 - 2}{2} = \frac{ - 1}{2} [/tex]
[tex] \frac{5}{5} - \frac{1}{3} = 1 - \frac{1}{3} = \frac{3 - 1}{3} = \frac{2}{3} [/tex]
[tex] \frac{7}{9} - \frac{2}{9} = \frac{7 - 2}{9} = \frac{5}{9} [/tex]
