\[\boxed{\text{5.280.}}\]
\[\textbf{а)}\ 14 - \frac{6}{9} = 13\frac{9}{9} - \frac{6}{9} = 13\frac{3}{9}\ \]
\[\textbf{б)}\ 82 - \frac{7}{15} = 81\frac{15}{15} - \frac{7}{15} =\]
\[= 81\frac{8}{15}\ \]
\[\textbf{в)}\ 5 - 4\frac{3}{4} = 4\frac{4}{4} - 4\frac{3}{4} = \frac{1}{4}\ \]
\[\textbf{г)}\ 44 - 3\frac{8}{11} = 43\frac{11}{11} - 3\frac{8}{11} =\]
\[= 40\frac{3}{11}\text{\ \ }\]