Explicação passo-a-passo:
[tex]a) \frac{3}{7} + \frac{5}{2} + \frac{1}{14} = mmc = 14[/tex]
[tex] \frac{6 + 35 + 1}{14} = \frac{42}{14} = 3[/tex]
[tex]b) \frac{4}{5} + \frac{1}{3} + \frac{7}{6} = mmc = 30[/tex]
[tex] \frac{24 + 10 + 35}{30} = \frac{71}{30} [/tex]
[tex]c) \frac{5}{4} - \frac{1}{2} = mmc = 4[/tex]
[tex] \frac{5 - 2}{4} = \frac{3}{4} [/tex]
[tex]d) \frac{3}{5} - \frac{2}{7} = mmc = 35[/tex]
[tex] \frac{21 - 10}{35} = \frac{11}{35} [/tex]
