а) 4x^2y^2-9a^4 = (2xy - 3a^2)(2xy + 3a^2)б) 25a^2-(a+3)^2 = (5a + (a+3))(5a - (a+3)) = (5a + a + 3)(5a - a - 3) = (6a + 3)(4a - 3)в) 27m^3+n^3 = (3m + n)(9m^2 - 3mn + n^2)
а) 4x^2y^2-9a^4 = (2xy - 3a^2)(2xy + 3a^2)
б) 25a^2-(a+3)^2 = (5a + (a+3))(5a - (a+3)) = (5a + a + 3)(5a - a - 3) = (6a + 3)(4a - 3)
в) 27m^3+n^3 = (3m + n)(9m^2 - 3mn + n^2)