\[\boxed{\text{5.\ 59}}\]
\[\textbf{а)}\ 8 \cdot 4 + 8 \cdot 16 = 8 \cdot (4 + 16) =\]
\[= 8 \cdot 20 = 160\]
\[\textbf{б)}\ 39 \cdot 23 - 29 \cdot 23 =\]
\[= 23 \cdot (39 - 29) = 23 \cdot 10 =\]
\[= 230\]
\[\textbf{в)}\ 5 \cdot 13 + 15 \cdot 13 =\]
\[= 13 \cdot (5 + 15) = 13 \cdot 20 = 260\]
\[\textbf{г)}\ 7 \cdot 21 - 2 \cdot 21 =\]
\[= 21 \cdot (7 - 2) = 21 \cdot 5 = 105\]
\[\textbf{д)}\ 2,4 \cdot 21 + 2,4 \cdot 9 =\]
\[= 2,4 \cdot (21 + 9) = 2,4 \cdot 30 =\]
\[= 24 \cdot 3 = 72\]
\[\textbf{е)}\ 1,4 \cdot 0,6 - 0,6 \cdot 0,6 =\]
\[= 0,6 \cdot (1,4 - 0,6) = 0,6 \cdot 0,8 =\]
\[= 0,48\]
\[\textbf{ж)}\ \frac{5}{6} \cdot \frac{7}{9} + \frac{5}{6} \cdot \frac{2}{9} = \frac{5}{6} \cdot \left( \frac{7}{9} + \frac{2}{9} \right) =\]
\[= \frac{5}{6} \cdot 1 = \frac{5}{6}\]
\[\textbf{з)}\ 2\frac{3}{17} \cdot \frac{4}{5} - 1\frac{3}{17} \cdot \frac{4}{5} =\]
\[= \frac{4}{5} \cdot \left( 2\frac{3}{17} - 1\frac{3}{17} \right) = \frac{4}{5} \cdot 1 = \frac{4}{5}\]
\[\textbf{и)}\ 2\frac{3}{13} \cdot 5\frac{1}{5} - 2\frac{1}{13} \cdot 5\frac{1}{5} =\]
\[= 5\frac{1}{5} \cdot \left( 2\frac{3}{13} - 2\frac{1}{13} \right) =\]
\[= \frac{26}{5} \cdot \frac{2}{13} = \frac{4}{5}\ \]