14. Найдите значение выражения 378 : (12 12/13 + 5 1/4).

\(12\frac{12}{13}=\frac{168}{13}\), \(5\frac{1}{4}=\frac{21}{4}\).

\(\frac{168}{13}+\frac{21}{4}=\frac{672+273}{52}=\frac{945}{52}\).

\(378:\frac{945}{52}=378\cdot\frac{52}{945}=\frac{2}{5}\cdot52=\frac{104}{5}=20\frac{4}{5}\).

Ответ: \(20\frac{4}{5}\).