x / y = 0.5 ---> x = 0.5y
ОДЗ
y ≠ 0 (т.к. на ноль делить нельзя и x / y = 0.5 > 0)
(x^2 - xy + y^2) / (x^2 + y^2), при x = 0.5y
(0.25y^2 - 0.5y^2 + y^2) / (0.25y^2 + y^2) =
= y^2(0.25 - 0.5 + 1) / y^2(0.25 + 1) =
= 0.75y^2 / 1.25y^2 = 0.6
x / y = 0.5 ---> x = 0.5y
ОДЗ
y ≠ 0 (т.к. на ноль делить нельзя и x / y = 0.5 > 0)
(x^2 - xy + y^2) / (x^2 + y^2), при x = 0.5y
(0.25y^2 - 0.5y^2 + y^2) / (0.25y^2 + y^2) =
= y^2(0.25 - 0.5 + 1) / y^2(0.25 + 1) =
= 0.75y^2 / 1.25y^2 = 0.6