a) \(\frac{9 \cdot 7 - 8 \cdot 7}{7 \cdot 5} = \frac{7 \cdot (9-8)}{7 \cdot 5} = \frac{7 \cdot 1}{7 \cdot 5} = \frac{1}{5}\)
б) \(\frac{13 \cdot 7 + 13 \cdot 9}{13 \cdot 32} = \frac{13 \cdot (7+9)}{13 \cdot 32} = \frac{13 \cdot 16}{13 \cdot 32} = \frac{16}{32} = \frac{1}{2}\)
в) \(\frac{16 \cdot 3 - 16 \cdot 2}{32} = \frac{16 \cdot (3-2)}{32} = \frac{16 \cdot 1}{32} = \frac{16}{32} = \frac{1}{2}\)
г) \(\frac{23 \cdot 6 - 23 \cdot 4}{46} = \frac{23 \cdot (6-4)}{46} = \frac{23 \cdot 2}{46} = \frac{46}{46} = 1\)