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$�� 7.3. �� :�) {xy(x+y)=2, x+xy+y=-3}; �) {5x-4xy-5y=32, xy(x-y)=-12};�) {3(x-y)^2+(2x+y)^2=9,...$

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7.3. �� :

�) {xy(x+y)=2, x+xy+y=-3}; �) {5x-4xy-5y=32, xy(x-y)=-12};

�) {3(x-y)^2+(2x+y)^2=9, (x-y)-4(2x+y)=-12};

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

�) {2(x+y)^2+3(x-2y)^2=12, 3(x+y)-2x+4y=-4};

�) {1/(x-y)^2+9/(x+y)^2=2, 4/(x-y)-3/(x+y)=3}.

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