33. \(\frac{1}{\frac{1}{63}+\frac{1}{72}}\)

\(\frac{1}{63}+\frac{1}{72}=\frac{8}{504}+\frac{7}{504}=\frac{15}{504}=\frac{5}{168}\).

\(1:\frac{5}{168}=\frac{168}{5}=33\frac{3}{5}\).

Ответ: \(33\frac{3}{5}\).