��.28.145 �� 11 �� (��)

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$�� 28.145. �� :1) {((x/y)(x^2-2y^2)=4, (y/x)(x^2+2y^2)=3);2) {(x^2+y^2+2(x+y)=23, x^2+y^2+xy=19);3) {(x^4+y^4=17, x^2+y^2=5);4)...$

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28.145. �� :

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

2) {(x^2+y^2+2(x+y)=23, x^2+y^2+xy=19);

3) {(x^4+y^4=17, x^2+y^2=5);

4) {(1/(x^2+y^2)+2xy=21/5, 1/(2xy)+x^2+y^2=21/4).

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