Respuesta:
[tex]\frac{11}{28}[/tex]
Explicación paso a paso:
[tex]\frac{9}{4} - 2+\frac{1}{7}\\\\\frac{7}{7}* \frac{9}{4} -\frac{28}{28}* 2+\frac{4}{4}*\frac{1}{7}\\\\\frac{63}{28}-\frac{56}{28}+\frac{4}{28}\\\\\frac{7}{28}+\frac{4}{28}\\\\\frac{11}{28}[/tex]
