1)
х-у=14 x^2-y^2=84 x=y 14 (y 14)^2-y^2=84 x=y 14 196 y^2 28y-y^2=84 x=14 y 28y=-112 x=14 y y=-4 x=10 y=-4
2) x^2-y^2=63 x y=7 x^2-y^2=63 x=7-y (7-y)^2-y^2=63 x=7-y 49 y^2-14y-y^2=63 x=7-y 14y=-14 x=7-y y=-1 x=8
уменя так
(x-y=14
(x2-y2=84
(x=14+y
((14+y)(в квадрате)-y(в квадрате)=84
(196+28y=84
(y=(84-196):28
(y=-4
(x=10
1)
х-у=14
x^2-y^2=84
x=y 14
(y 14)^2-y^2=84
x=y 14
196 y^2 28y-y^2=84
x=14 y
28y=-112
x=14 y
y=-4
x=10
y=-4
2)
x^2-y^2=63
x y=7
x^2-y^2=63
x=7-y
(7-y)^2-y^2=63
x=7-y
49 y^2-14y-y^2=63
x=7-y
14y=-14
x=7-y
y=-1
x=8
уменя так
(x-y=14
(x2-y2=84
(x=14+y
((14+y)(в квадрате)-y(в квадрате)=84
(x=14+y
(196+28y=84
(x=14+y
(y=(84-196):28
(x=14+y
(y=-4
(x=10
(y=-4