Сократи дробь: 3m - 3n / 7m-7n

Конечно, помогу! Сейчас сократим дроби. 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) $\frac{12a^2 - 6a}{3 - 6a} = \frac{6a(2a - 1)}{3(1 - 2a)} = -\frac{6a}{3} = -2a$ 6) $\frac{9b^2 - 1}{9b^2 + 6b + 1} = \frac{(3b - 1)(3b + 1)}{(3b + 1)^2} = \frac{3b - 1}{3b + 1}$ 7) $\frac{b^5 - b^4}{b^5 - b^6} = \frac{b^4(b - 1)}{b^5(1 - b)} = -\frac{b^4}{b^5} = -\frac{1}{b}$ 8) $\frac{7m^2 + 7m + 7}{m^3 - 1} = \frac{7(m^2 + m + 1)}{(m - 1)(m^2 + m + 1)} = \frac{7}{m - 1}$ 9) $\frac{64 - x^2}{3x^2 - 24x} = \frac{(8 - x)(8 + x)}{3x(x - 8)} = -\frac{8 + x}{3x}$