Losty's profile - activity

I would like to compute on Sage a Groebner basis generated by a set of polynomials containing coefficients like $\exp(-2/10)$ without rounding the coefficients, for example:

$$f_1 = e^{-1/2} x^2 - e^{-3/50} y x$$

$$f_2 = e^{-3/20} x + x y^2$$

Is there a simple way to do that? I tried to create an extension of QQbar including the transcendental coefficients, but I could not successfully do it. Any help would be greatly appreciated!