Сократить дробь. Задание во вложениях.
x^5-1=(x-1)(x^4+x^3+x^2+x+1)
x^3+1=(x+1)(x^2-x+1)
... = 1/(x-1)-1/(x+1)=2/(x^2-1)
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x^5-1=(x-1)(x^4+x^3+x^2+x+1)
x^3+1=(x+1)(x^2-x+1)
... = 1/(x-1)-1/(x+1)=2/(x^2-1)