Code: Select all
\documentclass{article}
\usepackage[nice]{nicefrac}
\usepackage{amsmath}
\usepackage{xfrac}
\begin{document}
Blablabla
\begin{equation}
(4 / 9)(5 / v) = (\nicefrac{4}{9})(\nicefrac{5}{v}) = \frac{2/3}{1/5} = \frac{\nicefrac{2}{3}}{\nicefrac{1}{5}}.
\end{equation}
Ou encore
\begin{equation}
(4 / 9)(5 / v) = (\sfrac{4}{9})(\sfrac{5}{v}) = \frac{2/3}{1/5} = \frac{\sfrac{2}{3}}{\sfrac{1}{5}}.
\end{equation}
\end{document}
What would you do in this case ? And which package is best : xfrac or nicefrac ?