Ответы на вопрос:
{lg(x^2+y^2)-lg10=lg13 x=9/7y
lg(x+y)/(x-y)=8; 81/49y^2+y^2=130
{lg((x^2+y^2)/10)=lg13 130/49y^2=130
lg(x+y)/(x-y)=lg8; y^2=49
{ x^2+y^2)/10=13 y=7,-7;
x+y)/(x-y)=8; x^2=81
{x^2+y^2=130 x=9,-9
x+y=8x-8y; (9,,-7)
{x^2+y^2=130
7x=9y;
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