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$�� 493. �� :�) {x/y+y/x=-5/2, x^2-y^2=13/4};�) {x^2+y^2=68, x/y-y/x=17/4};�) {|x|+|y|=6, x^2-y^2=24};�) {|x|-|y|=4,...$

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493. �� :

�) {x/y+y/x=-5/2, x^2-y^2=13/4};

�) {x^2+y^2=68, x/y-y/x=17/4};

�) {|x|+|y|=6, x^2-y^2=24};

�) {|x|-|y|=4, x^2+y^2=41}.

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