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$�� 28.142. �� :1) {(x^2+2xy+y^2=64, x-y=2); 4) {(3x^2+2y^2=18, 3x^2-2y^2=12);2) {(9x^2-6xy+y^2=9, 2x^2+2xy-y^2=11); 5) {(xy-y=-12,...$

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28.142. �� :

1) {(x^2+2xy+y^2=64, x-y=2); 4) {(3x^2+2y^2=18, 3x^2-2y^2=12);

2) {(9x^2-6xy+y^2=9, 2x^2+2xy-y^2=11); 5) {(xy-y=-12, 5x-xy=1);

3) {(x^2-xy=-6, y^2-xy=22); 6) {(x^2+4y^2=8, xy=2).

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