196. 1) x + y = 9;
4)
Решите систему уравнений (196—198):
(x2 - y2 = 18,
(x + y = 4,
2)
x2 - y2 = 32;
x = 7+ y,
y = x -5,
3)
|x? = 56+y?:
x2 = 10 + y
(y² + xy = 4,
xy + x2 = 10,
197. 1)
2)
x² + xy = -3;
xy + y2 = 15;
Ix-y=7,
x + y = 8,
3)
x² + y2 = 9 - 2xy;
x2 + y2 = 16 + 2xy.
(x3 -v3-9,
x + y = 26.
2)
x - y = 3;
[x+y=2.
4)
x
198. 1)
