ответ на фото
x/(x^2+x+1)=1/(x+1+(1/x))=1/8
x+1/x=t
1/(t+1)=1/8
t=7
x^2/(x^4+x^2+1) = 1/(x^2+1+(1/x^2)) = 1/((x+1/x)^2-1) = 1/(t^2-1) = 1/(7^2-1) = 1/48
ответ на фото
x/(x^2+x+1)=1/(x+1+(1/x))=1/8
x+1/x=t
1/(t+1)=1/8
t=7
x^2/(x^4+x^2+1) = 1/(x^2+1+(1/x^2)) = 1/((x+1/x)^2-1) = 1/(t^2-1) = 1/(7^2-1) = 1/48