4) 2a + 2b 7(a + b)' 37. Сократите дробь: a-b ; 2(b − a)' 1) 2) 38. Сократите дробь: 3m-3n 1) ; 7m-7n' 5a + 25b 3) 8) a-5b a² - 5ab' m² - 5mn 15n - 3m ; 12)m³ +1 m² - m + 1 x² - 25 5) 3x - 6y. ; 4y-2x 4) 7a4 - a³b b4_7ab3; x² - 49 4) ; 7) 6x + 42 12a² - 6a 2) 2a² + 10ab' 5) ; 3-6a 4x-16y. 3) ; 6) 16y 9b2 – 1 9b2 + 6b + 1 ' ; 9) 5x2 - x3 y² - 12y +36 6) 36 - y² 65-b4 65 - 66, 8) 7m² +7m+7; m³ -1 64 - x2 3x² - 24x

37. Сократите дробь:

• 4) \( \frac{2a + 2b}{7(a + b)} = \frac{2(a + b)}{7(a + b)} = \frac{2}{7} \)

• 1) \( \frac{a - b}{2(b - a)} = \frac{-(b - a)}{2(b - a)} = -\frac{1}{2} \)

• 2) \( \frac{3x - 6y}{4y - 2x} = \frac{3(x - 2y)}{-2(x - 2y)} = -\frac{3}{2} \)

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

• 8) \( \frac{a - 5b}{a^2 - 5ab} = \frac{a - 5b}{a(a - 5b)} = \frac{1}{a} \)

• 3) \( \frac{m^2 - 5mn}{15n - 3m} = \frac{m(m - 5n)}{-3(m - 5n)} = -\frac{m}{3} \)

• 4) \( \frac{7a^4 - a^3b}{b^4 - 7ab^3} = \frac{a^3(7a - b)}{b^3(b - 7a)} = -\frac{a^3}{b^3} \)

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

• 12) \( \frac{m^3 + 1}{m^2 - m + 1} = \frac{(m + 1)(m^2 - m + 1)}{m^2 - m + 1} = m + 1 \)

• 5) \( \frac{x^2 - 25}{5x^2 - x^3} = \frac{(x - 5)(x + 5)}{x^2(5 - x)} = -\frac{x + 5}{x^2} \)

• 6) \( \frac{y^2 - 12y + 36}{36 - y^2} = \frac{(y - 6)^2}{(6 - y)(6 + y)} = -\frac{y - 6}{6 + y} \)

• 7) \( \frac{b^5 - b^4}{b^5 - b^6} = \frac{b^4(b - 1)}{b^5(1 - b^2)} = \frac{b^4(b - 1)}{b^5(1 - b)(1 + b)} = -\frac{1}{b(1 + b)} \)

• 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) \( \frac{64 - x^2}{3x^2 - 24x} = \frac{(8 - x)(8 + x)}{3x(x - 8)} = -\frac{8 + x}{3x} \)