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$�� 6.4. �� , �� :�) {x^2-y^2=11, xy=30}; �) {x^2+y^2=34, xy=15};�) {x^2+y^2=52, xy=24}; �) {x^2-y^2=-45, xy=14};�)...$

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6.4. �� , �� :

�) {x^2-y^2=11, xy=30}; �) {x^2+y^2=34, xy=15};

�) {x^2+y^2=52, xy=24}; �) {x^2-y^2=-45, xy=14};

�) {xy=12, x^2-y^2=32}; �) {x^2+y^2=37, xy=6}.

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