x² + y² = 2xy + 5x
x² - 2xy + y² = 5x
(x-y)² = 5x
10² = 5x
100= 5x
x = 20
y = x - 10 = 20 - 10 = 10.
Ответ: (20;10).
20/2x(54+46/2)=770 20/2x(54+46)/2=500 (20/2x54+46)/2=293 20/2x54+46/2=563