... =(x^2 + y^2 - 2xy) / (2xy) : (x - y)^2 / (xy)^2 = (x^2 + y^2 - 2xy) / (2xy) * (xy)^2 / (x - y)^2 =
(x - y)^2 * (xy)^2 / (2xy * (x - y)^2) = xy / 2
xy = (V3 - 2)(V3 + 2) = 3 - 4 = -1
ответ: -1/2
... =(x^2 + y^2 - 2xy) / (2xy) : (x - y)^2 / (xy)^2 = (x^2 + y^2 - 2xy) / (2xy) * (xy)^2 / (x - y)^2 =
(x - y)^2 * (xy)^2 / (2xy * (x - y)^2) = xy / 2
xy = (V3 - 2)(V3 + 2) = 3 - 4 = -1
ответ: -1/2