Помогите решить систему: х^2 - 2y - xy + 2x - y + 1 = 0
2x^2 - y^2 + xy + 3y - 5 = 0

Вторая система:
3x^2y^2 + x^2 - 3xy = 7
10x^2y^2 + 3x^2 - 20xy = 3
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