��.613 �� 9 �� (��) (��)

�� #1

$�� 613. �� :�) {2x^2-3y^2=-16, (x-y)(x+y)=0}; �) {9x^2-y^2=0, x^2+y^2-x=0};�) {(2x+y)(2y-x)=0, (1/2)x^2-2xy-y^2=2}; �)...$

�� , ��, �� 9 ��, ��:

613. �� :

�) {2x^2-3y^2=-16, (x-y)(x+y)=0}; �) {9x^2-y^2=0, x^2+y^2-x=0};

�) {(2x+y)(2y-x)=0, (1/2)x^2-2xy-y^2=2}; �) {x^2-y^2-y=24, x^2-4y^2=0}.

*�� .

(�� )

*�� , ��