(a - b)^2 = a^2 - 2ab + b^2(y - 5)^2 = y^2 - 2*y*5 + 5^2 = y^2 - 10y + 25(a + b)^2 = a^2 + 2ab + b^2(6x + a)^2 = (6x)^2 + 2*(6x)*a + a^2 = 36x^2 + 12xa + a^2(a - b)(a + b) = a^2 - b^2(4c - 1)(4c + 1) = (4c)^2 - 1^2 = 16c^2 - 1Ответ: а) y^2 - 10y + 25; б) 36x^2 + 12xa + a^2; в) 16c^2 - 1