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$�� 12.8. �� :1) {(2x^2-3xy+5y=5, (x-2)(y-1)=0);2) {((x-1)y=2x-2, x^2+y^2+3xy=4);3) {(2x^2-xy-3y=7, 2x^2+x-3=(x-1)(y+5));4) {(x^2-2xy+y^2=9,...$

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12.8. �� :

1) {(2x^2-3xy+5y=5, (x-2)(y-1)=0);

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

3) {(2x^2-xy-3y=7, 2x^2+x-3=(x-1)(y+5));

4) {(x^2-2xy+y^2=9, 4x^2+xy+4y^2=18).

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