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$�� 5.5. �� :�) {x+y=7, x^2-y^2=-7}; �) {x-y=2, x^2-y^2=16};�) {x-y=-5, x^2+y^2=13}; �) {x-y=5, x^2+y^2=17};�) {x+y=7/6,...$

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5.5. �� :

�) {x+y=7, x^2-y^2=-7}; �) {x-y=2, x^2-y^2=16};

�) {x-y=-5, x^2+y^2=13}; �) {x-y=5, x^2+y^2=17};

�) {x+y=7/6, x^2-y^2=-7/36}; �) {x-y=-7/6, x^2+y^2=25/36}.

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