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$�� 598. �� :1) {(x^2-5y^2=-1, 3xy+7y^2=1); 2) {(3y^2-2xy=160, y^2-3xy-2x^2=8);3) {(1/x+1/y=3/2, 1/x^2+1/y^2=5/4); 4) {(1/x+1/y=1/3,...$

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598. �� :

1) {(x^2-5y^2=-1, 3xy+7y^2=1); 2) {(3y^2-2xy=160, y^2-3xy-2x^2=8);

3) {(1/x+1/y=3/2, 1/x^2+1/y^2=5/4); 4) {(1/x+1/y=1/3, 1/x^2-1/y^2=4/3);

5) {(2x^2+y^2+5xy=32, y^2-xy-2x^2=0); 6) {(x^2-2y^2+4xy=-45, y^2-xy-6x^2=0);

7) {(27x^3-y^3=26, 9x^2+3xy+y^2=13); 8) {(x^3+8y^3=12xy, x+2y=6).

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