а) 3m - 3n + m^2 - n^2 = (3 - n)(m + n)б) a^2 + 5a - b^2 + 5b = (a + 5)(a - b)в) 9x^2 - a^2 + 9x - 3a = (3x + a)(3x - a) + 3(3x - a) = (3x - a)(3x + 3) = 3(x - a)(3(x + 1))
а) 3m - 3n + m^2 - n^2 = (3 - n)(m + n)
б) a^2 + 5a - b^2 + 5b = (a + 5)(a - b)
в) 9x^2 - a^2 + 9x - 3a = (3x + a)(3x - a) + 3(3x - a) = (3x - a)(3x + 3) = 3(x - a)(3(x + 1))