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$�� 7.6. �� :�) {(x+2y)^2+(y-2x)^2=80, (x+2y)+(y-2x)=12};�) {(x+y)^2+5x=6-5y, (x-y)^2+x=12+y};�)...$

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7.6. �� :

�) {(x+2y)^2+(y-2x)^2=80, (x+2y)+(y-2x)=12};

�) {(x+y)^2+5x=6-5y, (x-y)^2+x=12+y};

�) {(1/x)^2+(1/y)^2=13, 1/x+1/y=5};

�) {(x-y)^2+(x+y)^2=74, (x-y)+(x+y)=12};

�) {(x+2y)^2-x=42+2y, (x-2y)^2-x=20-2y};

�) {1/(x+y)-1/(x-y)=-3, 1/(x-y)^2+1/(x+y)^2=29}.

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