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$�� 7.2. �� :�) {x^2-3y^2=-3, x^4-y^4=65}; �) {2x^2-3y^2=-10, x^4-y^4=-15};�) {x^2+2y^2=17, x^4+2y^4=113}; �)...$

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7.2. �� :

�) {x^2-3y^2=-3, x^4-y^4=65}; �) {2x^2-3y^2=-10, x^4-y^4=-15};

�) {x^2+2y^2=17, x^4+2y^4=113}; �) {3x^2+y^2=28, 2x^4-y^4=161};

�) {(x+y)^2+2(x-y)^2=11, (x+y)^4-(x-y)^4=80};

�) {(2x+y)^2+3(x-y)^2=36, (2x+y)^4-2(x-y)^4=-81}.

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