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$�� 12.12. �� :1) {(2x^2-5xy+3x-2y=2, 5xy-2x^2+7x-8y=-22);2) {((x^2+y)^2 (x^2-xy+y)=4, (x^2+y)^2 (x^2+xy+y)=12);3) {(y^2+x+1=-y, x^2+y+1=-x);4)...$

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12.12. �� :

1) {(2x^2-5xy+3x-2y=2, 5xy-2x^2+7x-8y=-22);

2) {((x^2+y)^2 (x^2-xy+y)=4, (x^2+y)^2 (x^2+xy+y)=12);

3) {(y^2+x+1=-y, x^2+y+1=-x);

4) {(x^3-3x^2 y+3xy^2=-1, y^3+y-x=1).

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