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$�� 747. �� :1) {(x^3-y^3=61(x-y), (x+1)(y+1)=12);2) {(2x^2y^2-3y^2+5xy-6=0, 3x^2y^2-4y^2+3xy-2=0);3) {(x^2/y+y^2/x=12, 1/x+1/y=1/3);4)...$

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747. �� :

1) {(x^3-y^3=61(x-y), (x+1)(y+1)=12);

2) {(2x^2y^2-3y^2+5xy-6=0, 3x^2y^2-4y^2+3xy-2=0);

3) {(x^2/y+y^2/x=12, 1/x+1/y=1/3);

4) {(xy/(x+2y)+(x+2y)/xy=2, xy/(x-2y)+(x-2y)/xy=4);

5) {(x^3y+xy^3=(10/9)(x+y)^2, x^4y+xy^4=(2/3)(x+y)^3);

6) {(x(y^2+1)/(x^2+y^2)=3/5, y(x^2-1)/(x^2+y^2)=4/5).

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