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$�� 181. �� :�) {y/x+x/y=13/y, x+y=5}; �) {x-y=1, x^3-y^3=7};�) {y/x=2, (x-1)^2+y^2=1}; �) {x^3+y^3=35,...$

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181. �� :

�) {y/x+x/y=13/y, x+y=5}; �) {x-y=1, x^3-y^3=7};

�) {y/x=2, (x-1)^2+y^2=1}; �) {x^3+y^3=35, x+y=5}.

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