Решите систему уравнений : x+y=2
2x^2+xy+y^2=8
X=2-y 2(2-y)^2 + (2-y)*y + y^2=8 X=2-y 2(4-4y+y^2) +2y-y^2+y^2-8=0 X=2-y 2y^2-8y=0 X=2-y 2y(y-4)=0 1) x=2-y y=0 X=2 Y=0 2) x=2-y y=4 x=2-4 y=4 x= -2 y=4