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$�� 194. �� :�) {lg(x)-lg(y)=1, lg^2(x)+lg^2(y)=5};�) {log(2; x^2+y^2)=5, 2log(4; x)+log(2; y)=4};�) {lg(x)-lg(y)=7, lg(x)+lg(y)=5};�) {log(2;...$

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194. �� :

�) {lg(x)-lg(y)=1, lg^2(x)+lg^2(y)=5};

�) {log(2; x^2+y^2)=5, 2log(4; x)+log(2; y)=4};

�) {lg(x)-lg(y)=7, lg(x)+lg(y)=5};

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

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