\[\boxed{\text{5.343.}}\]
\[\textbf{а)}\ \frac{9 \cdot 7 - 8 \cdot 7}{7 \cdot 5} = \frac{7 \cdot (9 - 8)}{7 \cdot 5} =\]
\[= \frac{7 \cdot 1}{7 \cdot 5} = \frac{1}{5}\]
\[\textbf{б)}\ \frac{13 \cdot 7 + 13 \cdot 9}{13 \cdot 32} =\]
\[= \frac{13 \cdot (7 + 9)}{13 \cdot 32} = \frac{13 \cdot 16}{13 \cdot 32} = \frac{1}{2}\ \]
\[\textbf{в)}\ \frac{16 \cdot 3 - 16 \cdot 2}{32} =\]
\[= \frac{16 \cdot (3 - 2)}{32} = \frac{16 \cdot 1}{32} = \frac{16}{32} = \frac{1}{2}\ \]
\[\textbf{г)}\ \frac{23 \cdot 6 - 23 \cdot 4}{46} =\]
\[= \frac{23 \cdot (6 - 4)}{46} = \frac{23 \cdot 2}{23 \cdot 2} = 1\ \ \]