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$�� 612. �� :�) {x^2+y^2=29, xy=-10}; �) {x^2+3xy+y^2=31, xy-6=0};�) {1-xy=0, x^2+y^2=4 1/4}; �) {x^2-4xy+y^2=6,...$

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612. �� :

�) {x^2+y^2=29, xy=-10}; �) {x^2+3xy+y^2=31, xy-6=0};

�) {1-xy=0, x^2+y^2=4 1/4}; �) {x^2-4xy+y^2=6, 5-xy=0}.

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