Respuesta:
[tex] \frac{5}{7} + \frac{1}{4} \times \frac{2}{5} - \frac{4}{6} [/tex]
[tex] \frac{5}{7} + \frac{2}{20} [/tex] - [tex] \frac{ 4}{6} [/tex]
[tex] \frac{5}{7} + \frac{1}{10} [/tex] - [tex] \frac{ 4}{6} [/tex]
[tex] \frac{50}{70} + \frac{7}{70} [/tex] - [tex] \frac{ 4}{6} [/tex]
[tex] \frac{57}{70} - \frac{2}{3} [/tex]
[tex] \frac{171}{210} - \frac{140}{210} [/tex]
[tex] \frac{31}{210}
