Решите систему уравнений
X+y=-5 x²-y²=13 (x-y)(x+y)=13 x-y=-13/5 x+y+x-y=-5-13/5 2x=-38/5 x=-19/5 x+y=-5 y=-5+19/5=6/4 (6/5 -19/5)