Question

Сократите дробь:
1)y^2+y/y^2  2) x^4-x^8/x^6-x^2  3) a^2-2a/a^2-4

Answer 1

1)y^2+y/y^2 =у(у+1)/у=у+1
2) x^4-x^8/x^6-x^2 = х^4(1-х^4)/(х^2*(х^3-1))=
=(х^2(1-х^4))/(х^3-1)
3) a^2-2a/a^2-4 = а(а-2)/(а-2)(а+2)=а/(а+2)