а) a² - b² - 2bc - c² = (a - b)(a + b) - 2c(b + c) = (a - b - c)(a + b + c)
б) 4d⁴ - 4b² + 1 - c² = (2d² - 1)² - (2b + c)(2b - c)
в) 16(x - y)² - 25(x+y)² = (4(x - y) + 5(x + y))(4(x - y) - 5(x + y))
а) a² - b² - 2bc - c² = (a - b)(a + b) - 2c(b + c) = (a - b - c)(a + b + c)
б) 4d⁴ - 4b² + 1 - c² = (2d² - 1)² - (2b + c)(2b - c)
в) 16(x - y)² - 25(x+y)² = (4(x - y) + 5(x + y))(4(x - y) - 5(x + y))