Calcule:

a)
[tex] \frac{1}{3} + \frac{5}{2} = [/tex]
b)
[tex] \frac{12}{6} - \frac{3}{8} = [/tex]
c)
[tex] \frac{3}{4} + \frac{2}{9} + \frac{5}{12} = [/tex]
​