Resposta :
[tex]a + b - c \\ \\ \frac{1}{5} + \frac{5}{6} = \frac{6 + 25}{30} = \frac{31}{30} \\ \\ \frac{31}{30} - \frac{1}{9} = \frac{279 - 30}{270} = \frac{249}{270} \\ \\ simplifica \: \: por \: \: 3 = \frac{83}{90} [/tex]
Resposta: 83/90
[tex]a + b - c \\ \\ \frac{1}{5} + \frac{5}{6} = \frac{6 + 25}{30} = \frac{31}{30} \\ \\ \frac{31}{30} - \frac{1}{9} = \frac{279 - 30}{270} = \frac{249}{270} \\ \\ simplifica \: \: por \: \: 3 = \frac{83}{90} [/tex]
Resposta: 83/90