��.13.23 �� 9 �� (��)

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$�� 13.23. �� :1) {(x-y+v((x-y)/(x+y))=20/(x+y), x^2+y^2=34);2) {(x^2+y^2-x-2y-5=0, 2x^2+3y^2-2x-6y-13=0);3) {(v(x+1/y)+v(y+1/x)=2v2,...$

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13.23. �� :

1) {(x-y+v((x-y)/(x+y))=20/(x+y), x^2+y^2=34);

2) {(x^2+y^2-x-2y-5=0, 2x^2+3y^2-2x-6y-13=0);

3) {(v(x+1/y)+v(y+1/x)=2v2, (x^2+1)y+(y^2+1)x=4xy).

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