Hello,
I am posting again on the same subject but with more precision.
I use Standalone Context in its latest version.
We can observe that the alignment is not correct with \dfrac{}{} but it is
with {}\ over{}. But if I use Texlive 2016 there are no problems.
Thank you
Fabrice
#########################################################
\starttext
\startitemize[n][stopper={.},style=bold,color=darkred]
\item Soit \math{f} la fonction définie pour tout réel \m{x} différent de
\m{-1} par \math{f(x)=\dfrac{x+2}{x+1}} et \math{\cal C} sa courbe
représentative dans un repère du plan.
\startitemize[a][stopper={.},style=bold,color=darkred]
\item L'image de 3 par la fonction \math{f} est :
\startitemize[i,columns,joinedup,three]
[stopper={.},style=bold,color=darkred,grid=line]
\item \math{{14}\over {3}}
\item \math{{5}\over {4}}
\item \math{2}
\stopitemize
\startitemize[i,columns,joinedup,three]
[stopper={.},style=bold,color=darkred,grid=line]
\item \math{\dfrac{14}{3}}
\item \math{\dfrac{5}{4}}
\item \math{2}
\stopitemize
\stopitemize
\stopitemize
#########################################################
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