x + 2 ---------- 2 x + x + 1
(x + 2)/(x^2 + x + 1)
(2 + x)/(1 + x + x^2)
2 + x ---------- 2 1 + x + x
(2.0 + x)/(1.0 + x + x^2)
2 + x ------------- 1 + x*(1 + x)
(2 + x)/(1 + x*(1 + x))