а) 7xy² - 7xb² = 7x(y² - b²) = 7x(y + b)(y - bб) 81m² - 1 = (9m + 1)(9m - 1в) -6a² + 6 = -6(a² - 1) = -6(a + 1)(a - 1г) 128bx² - 2b = 2b(64x² - 1) = 2b(8x + 1)(8x - 1д) 169a⁸ - 25a⁶ = 13a³(13a⁵ - 25е) 18b³a² - 2b = 2b(9b²a² - 1) = 2b(3ba + 1)(3ba - 1)
а) 7xy² - 7xb² = 7x(y² - b²) = 7x(y + b)(y - b
б) 81m² - 1 = (9m + 1)(9m - 1
в) -6a² + 6 = -6(a² - 1) = -6(a + 1)(a - 1
г) 128bx² - 2b = 2b(64x² - 1) = 2b(8x + 1)(8x - 1
д) 169a⁸ - 25a⁶ = 13a³(13a⁵ - 25
е) 18b³a² - 2b = 2b(9b²a² - 1) = 2b(3ba + 1)(3ba - 1)