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$�� 188. �� :1) {x+y=1, xy=-20); 3) {x^2+xy-5y=-3, 4x-y=3};2) {x+3y=1, x^2+2xy-y^2=-1}; 4) {2x-3y=-5,...$

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188. �� :

1) {x+y=1, xy=-20); 3) {x^2+xy-5y=-3, 4x-y=3};

2) {x+3y=1, x^2+2xy-y^2=-1}; 4) {2x-3y=-5, 4x^2+6y=13}.

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