(x - y)/(x + y) = 12/1313(x - y) = 12(x + y)13x - 13y = 12x + 12y13x - 12x = 13y + 12yx = 25y
(x^2) / (y^2) = (25y)^2 / y^2= 625y^2 / y^2= 625
Ответ: x^2/y^2 = 625.
(x - y)/(x + y) = 12/13
Подставляем x = 25y в выражение x^2/y^2:13(x - y) = 12(x + y)
13x - 13y = 12x + 12y
13x - 12x = 13y + 12y
x = 25y
(x^2) / (y^2) = (25y)^2 / y^2
= 625y^2 / y^2
= 625
Ответ: x^2/y^2 = 625.