а) (2x-5)^2 = 4x^2 - 20x + 25
б) (3a+1)^2/(2b)^2 = (9a^2 + 6a + 1) / 4b^2
в) (a+4b)(a-4b) = a^2 - 16b^2
г) (2x-1/2a^2)(2x+1/2a^2) = 4x^2 - 1/4a^4
а) (2x-5)^2 = 4x^2 - 20x + 25
б) (3a+1)^2/(2b)^2 = (9a^2 + 6a + 1) / 4b^2
в) (a+4b)(a-4b) = a^2 - 16b^2
г) (2x-1/2a^2)(2x+1/2a^2) = 4x^2 - 1/4a^4