It’s true that \vtop{…} does the job for a single line of items, but it doesn’t 
in the case there’re multiple (\vtop{}) aligns with the bottom.

Here’s a modified MWE

\startitemize[n][style=\bf]
  \item \godown[-\lineheight] \startitemize 
[a,columns,two,packed,broad][stopper=),before={\blank[nowhite]}]
    \item $6(x - \dfrac{5}{12})^2 - \dfrac{1}{24}$
    \item $-3(x - \dfrac{1}{3})^2 + \dfrac{1}{3}$
    \item $7(x + \dfrac{5}{14})^2 + \dfrac{199}{28}$
    \item $-\dfrac{1}{2}(x + 2)^2 + \dfrac{9}{2}$
  \stopitemize
\stopitemize

A. Christe
Le 22 août 2023 à 04:08 +0200, fv leung <fvle...@gmail.com>, a écrit :
> I'd do it this way:
>
> \starttext
> \startitemize[n][style=\bf]
> \item\vtop{%
>   \startitemize[a,horizontal,four][stopper=\)]
>     \startitem
>       $6(x - \dfrac{5}{12})^2 - \dfrac{1}{24}$
>     \stopitem
>     \startitem
>       $-3(x - \dfrac{1}{3})^2 + \dfrac{1}{3}$
>     \stopitem
>     \startitem
>       $7(x + \dfrac{5}{14})^2 + \dfrac{199}{28}$
>     \stopitem
>     \startitem
>       $-\dfrac{1}{2}(x + 2)^2 + \dfrac{9}{2}$
>     \stopitem
>   \stopitemize
> }
> \stopitemize
>
> \stoptext
>
> > Alexandre Christe <aleks.chri...@gmail.com> 於 2023年8月22日 週二 上午2:58寫道:
> > > Dear ConTeXt users,
> > >
> > > Time goes by but I haven't yet found a nice solution to this issue. When 
> > > having mathematics, I'd not like to adjust by hand the factor of 
> > > \linewidth for the \godown command.
> > >
> > > Here's a MWE
> > >
> > > \starttext
> > >
> > > \startitemize[n][style=\bf]
> > >   \item \godown[-\lineheight] \startitemize 
> > > [a,columns,four,packed,broad][stopper=),before={\blank[nowhite]}]
> > >     \item $6(x - \dfrac{5}{12})^2 - \dfrac{1}{24}$
> > >     \item $-3(x - \dfrac{1}{3})^2 + \dfrac{1}{3}$
> > >     \item $7(x + \dfrac{5}{14})^2 + \dfrac{199}{28}$
> > >     \item $-\dfrac{1}{2}(x + 2)^2 + \dfrac{9}{2}$
> > >   \stopitemize
> > > \stopitemize
> > >
> > > \stoptext
> > >
> > > Thanks in advance.
> > >
> > > > Le ven. 2 sept. 2022 à 11:24, fv leung via ntg-context 
> > > > <ntg-context@ntg.nl> a écrit :
> > > > >
> > > > > \starttext
> > > > >
> > > > > \startitemize[n]
> > > > > \item\godown[-\lineheight]
> > > > >   
> > > > > \startitemize[a,columns,packed][before={\blank[nowhite]},right=\),stopper=]
> > > > >   \item bla
> > > > >   \item bla
> > > > >   \item bla
> > > > >   \item bla
> > > > >   \stopitemize
> > > > > \item\godown[-\lineheight]
> > > > >   
> > > > > \startitemize[a,columns,packed][before={\blank[nowhite]},n=3,right=\),stopper=]
> > > > >   \item bla
> > > > >   \item bla
> > > > >   \item bla
> > > > >   \item bla
> > > > >   \item bla
> > > > >   \item bla
> > > > >   \stopitemize
> > > > > \item\godown[-\lineheight]
> > > > >   
> > > > > \startitemize[a,columns,packed][before={\blank[nowhite]},n=4,right=\),stopper=]
> > > > >   \item bla
> > > > >   \item bla
> > > > >   \item bla
> > > > >   \item bla
> > > > >   \item bla
> > > > >   \item bla
> > > > >   \item bla
> > > > >   \item bla
> > > > >   \stopitemize
> > > > > \stopitemize
> > > > >
> > > > > \stoptext
> > > > >
> > > > > > Alexandre Christe via ntg-context <ntg-context@ntg.nl> 於 2022年9月2日 
> > > > > > 週五 下午5:08寫道:
> > > > > > > Dear all,
> > > > > > >
> > > > > > > I'm struggling to setup a nested itemize with no blank line and 
> > > > > > > several columns.
> > > > > > >
> > > > > > > What I mean is something like
> > > > > > > 1. a) bla   c) bla
> > > > > > >     b) bla   d) bla
> > > > > > >
> > > > > > > The following MWE is my starting point
> > > > > > >
> > > > > > > \starttext
> > > > > > > \startitemize[n]
> > > > > > > \item \blank[-line]
> > > > > > > \startitemize[a,horizontal,two] [margin=2cm]
> > > > > > > \item First
> > > > > > > \item Second
> > > > > > > \item Third
> > > > > > > \item Fourth
> > > > > > > \stopitemize
> > > > > > > \item \blank[-line]
> > > > > > > \startitemize[a,horizontal,columns,two]
> > > > > > > \item First
> > > > > > > \item Second
> > > > > > > \item Third
> > > > > > > \item Fourth
> > > > > > > \stopitemize
> > > > > > > \stopitemize
> > > > > > > \stoptext
> > > > > > >
> > > > > > > Thanks in advance
> > > > > > > ___________________________________________________________________________________
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> If your question is of interest to others as well, please add an entry to the 
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>
> maillist : ntg-context@ntg.nl / 
> https://www.ntg.nl/mailman/listinfo/ntg-context
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> ___________________________________________________________________________________
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If your question is of interest to others as well, please add an entry to the 
Wiki!

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