determine as somas e as diferenças de:
[tex] \frac{9}{5} + \frac{7}{5} [/tex]
[tex] \frac{5}{3} + \frac{1}{4} [/tex]

[tex] \frac{1}{3} + 4[/tex]
[tex] \frac{10}{12} + \frac{2}{12} [/tex]
​