��.125 �� 10-11 �� (��)

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$�� 125. �� :�) {(x-y)(x^2-y^2)=3a^3, (x+y)(x^2+y^2)=15a^3};�) {x^2-xy+y^2=21,...$

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125. �� :

�) {(x-y)(x^2-y^2)=3a^3, (x+y)(x^2+y^2)=15a^3};

�) {x^2-xy+y^2=21, y^2-2xy+15=0}.

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