Question

система уравнении x²-2xy+y²=xy-1; x-y=1

Answer 1

$left { {{x^2-2xy+y^2=xy-1} atop {x-y=1}} right. ; left { {{(x-y)^2=xy-1} atop {x-y=1}} right. ; left { {{1=xy-1} atop {x-y=1}} right. ; left { {{xy=2} atop {x-y=1}} right. ; left { {{x(x-1)=2} atop {y=x-1}} right. \\\ left { {{x^2-x-2=0} atop {y=x-1}} right. ; left { {{x_1=2,; x_2=-1; (teor.; Vieta)} atop {y_1=1,; y_2=-2}} right. ; Rightarrow ; ; Otvet::; (2,1),; (-1,-2).$

Answer 2

http://znanija.com/task/9719820 это еще помогите)