38. Сократите дробь:

38. Сократите дробь:

1) \( \frac{3m - 3n}{7m - 7n} = \frac{3(m - n)}{7(m - n)} = \frac{3}{7} \)

2) \( \frac{5a + 25b}{2a^2 + 10ab} = \frac{5(a + 5b)}{2a(a + 5b)} = \frac{5}{2a} \)

3) \( \frac{4x - 16y}{16y} = \frac{4(x - 4y)}{16y} = \frac{x - 4y}{4y} \)

4) \( \frac{x^2 - 49}{6x + 42} = \frac{(x - 7)(x + 7)}{6(x + 7)} = \frac{x - 7}{6} \)

5) \( \frac{12a^2 - 6a}{3 - 6a} = \frac{6a(2a - 1)}{-3(2a - 1)} = -2a \)

6) \( \frac{9b^2 - 1}{9b^2 + 6b + 1} = \frac{(3b - 1)(3b + 1)}{(3b + 1)^2} = \frac{3b - 1}{3b + 1} \)