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$�� 13.19. �� :1) {(x^2 y+y^2 x=20, 1/x+1/y=5/4);2) {(x^2/y+y^2/x=12, 1/x+1/y=1/3);3) {(x^3+x^3 y^3+y^3=12, x+xy+y=0);4) {(x^3+y^3=19,...$

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13.19. �� :

1) {(x^2 y+y^2 x=20, 1/x+1/y=5/4);

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

3) {(x^3+x^3 y^3+y^3=12, x+xy+y=0);

4) {(x^3+y^3=19, (xy+8)(x+y)=2).

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