Ответ:
\[\frac{\frac{1}{72}-\frac{1}{99}}{\frac{5}{33}}=\frac{\frac{99-72}{72\cdot99}}{\frac{5}{33}}=\frac{27}{7128}\cdot\frac{33}{5}=\frac{1}{264}\cdot\frac{33}{5}=\frac{1}{40}.\]
Ответ: \(\frac{1}{40}\).
\[\frac{\frac{1}{72}-\frac{1}{99}}{\frac{5}{33}}=\frac{\frac{99-72}{72\cdot99}}{\frac{5}{33}}=\frac{27}{7128}\cdot\frac{33}{5}=\frac{1}{264}\cdot\frac{33}{5}=\frac{1}{40}.\]
Ответ: \(\frac{1}{40}\).