Ответ:
\(\frac{1}{8}+\frac{1}{4}=\frac{1}{8}+\frac{2}{8}=\frac{3}{8}\).
\(\frac{7}{12}:\frac{3}{8}=\frac{7}{12}\cdot\frac{8}{3}=\frac{14}{9}\).
Ответ: \(\frac{14}{9}\).
\(\frac{1}{8}+\frac{1}{4}=\frac{1}{8}+\frac{2}{8}=\frac{3}{8}\).
\(\frac{7}{12}:\frac{3}{8}=\frac{7}{12}\cdot\frac{8}{3}=\frac{14}{9}\).
Ответ: \(\frac{14}{9}\).