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$�� 13.25. �� :1) {(x^2+xy+6=0, 24-y^2=(4x^2-y^2)^2);2) {(x^2 y^2-2x+y^2=0, 2x^2-4x+3+y^3=0);3) {(x^2-xy^2+4=0, x^2+y^2+4=4x+2y);4)...$

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13.25. �� :

1) {(x^2+xy+6=0, 24-y^2=(4x^2-y^2)^2);

2) {(x^2 y^2-2x+y^2=0, 2x^2-4x+3+y^3=0);

3) {(x^2-xy^2+4=0, x^2+y^2+4=4x+2y);

4) {(2+3y^2=2xy, |xy-2|=6-x^2).

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