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$�� 13.11. �� :1) {(x^2+3xy=7, y^2+xy=6);2) {(x^2+xy-y^2=20, x^2+3xy-3y^2=28);3) {(x^2+4xy-3y^2=2, x^2-xy+5y^2=5);4) {(2x^2-3xy+2y^2=14,...$

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13.11. �� :

1) {(x^2+3xy=7, y^2+xy=6);

2) {(x^2+xy-y^2=20, x^2+3xy-3y^2=28);

3) {(x^2+4xy-3y^2=2, x^2-xy+5y^2=5);

4) {(2x^2-3xy+2y^2=14, x^2+xy-y^2=5).

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