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$�� 13.2. �� :1) {(x/y+y/x=13/6, x^2+y^2=13);2) {((x+y)/(x-y)+(x-y)/(x+y)=5/2, x^2+y^2=20);3) {(x+y+1)^2+(x+y)^2=25, x^2-y^2=3);4)...$

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13.2. �� :

1) {(x/y+y/x=13/6, x^2+y^2=13);

2) {((x+y)/(x-y)+(x-y)/(x+y)=5/2, x^2+y^2=20);

3) {(x+y+1)^2+(x+y)^2=25, x^2-y^2=3);

4) {(v((x+y)/(x-y))+3v((x-y)/(x+y))=4, x^2+4x+y^2-3y=0).

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