Respuesta:
a) \frac{7}{3} + \frac{4}{5} = \frac{35 + 20}{15} = \frac{55}{15} = \frac{11}{3} \\\\b) \frac{7}{2} - \frac{3}{8} = \frac{7 - 12}{2} = \frac{-5}{2} \\\\c) \frac{15}{7} + \frac{9}{8} = \frac{120 + 63}{56} = \frac{183}{56} \\\\d) \frac{8}{5} - \frac{4}{9} = \frac{72 - 20}{45} = \frac{52}{45}
e) \frac{15}{2} * \frac{8}{3} = \frac{120}{6} = 20 \\\\f) \frac{16}{9} / \frac{12}{15} = \frac{16}{9} / \frac{4}{5} = \frac{16}{9} * \frac{5}{4} = \frac{80}{36} = \frac{20}{9}\\\\g) \frac{27}{8} * \frac{16}{9} = \frac{432}{72} = \frac{48}{8} = 6