Explicação passo-a-passo:

[tex]c)1 - \frac{2}{5} + \frac{1}{3} = mmc =1 5[/tex]

[tex] \frac{15 - 6 + 5}{15} = \frac{14}{15} = [tex]d) \frac{3}{4} + \frac{2}{6} + \frac{1}{8} = mmc = 24[/tex]

[tex] \frac{18+ 12 + 3}{24} = \frac{33}{24} = \div \frac{3}{3} = \frac{11}{8} [/tex]