а) x²y - 2x = x(xy - 2)
б) 3a²b - 9ab² = 3ab(a - 3b)
в) m² - 4n = (m - 2√n)(m + 2√n)
г) a³ - a = a(a² - 1) = a(a - 1)(a + 1)
д) x² + 6x + 9 = (x + 3)²
е) a³ - 10a + 25 = (a - 5)²
ж) ax + bx + ay + by = (a + b)(x + y)
3) ab - b + 3a - 3 = b(a - 1) + 3(a - 1) = (a - 1)(b + 3)
а) x²y - 2x = x(xy - 2)
б) 3a²b - 9ab² = 3ab(a - 3b)
в) m² - 4n = (m - 2√n)(m + 2√n)
г) a³ - a = a(a² - 1) = a(a - 1)(a + 1)
д) x² + 6x + 9 = (x + 3)²
е) a³ - 10a + 25 = (a - 5)²
ж) ax + bx + ay + by = (a + b)(x + y)
3) ab - b + 3a - 3 = b(a - 1) + 3(a - 1) = (a - 1)(b + 3)