Efectue as operações e apresente a resposta na forma simplificada.

a)
 \frac{3}{13 } + \frac{5}{13}
b)
 \frac{1}{3} + \frac{2}{4}
c)
 \frac{3}{4} + \frac{5}{6} - \frac{1}{2}
d)
 \frac{5}{7} x \frac{3}{5}
e)
 \frac{3}{4} \div \frac{2}{5}
f)
 \frac{4}{5} \div 3
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