Hello, John. I opened the slides/slide1.xml in example.pptx to see what is 
the difference between \sqrt{x} and \sqrt[\square]{x}. There is the 
diffence:
<m:oMath 
xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math">
<m:rad>
        <m:radPr>
                *<m:degHide m:val="1" />*
                        *<m:degHide m:val="on" />*
                </m:radPr>
                <m:deg />
                <m:e>
                        <m:r>
                                <m:t>x</m:t>
                        </m:r>
                </m:e>
      </m:rad>
</m:oMath>
the red one leads "a blank square on the left of root sign"，the blue one 
leads the correct root sign.
I think the val 1 not = val on in the pptx.
however the xml in sample.docx converted by pandoc is the blue one . 
在2022年7月1日星期五 UTC+8 18:15:09<John MacFarlane> 写道：

>
> Looks like the pptx writer tries to render math in native
> Word format, using texmath to convert just like the docx
> writer. I'm not really sure why there would be a difference
> in how the same equation appears.
>
> Sukil Etxenike arizaleta <suki...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
>
> > Hi,
> >
> > I don't know. It may not be rendering math the same way, although both 
> > are Office products. A note, also, the docs don't say how math is 
> > rendered in Power Point. They say that it's rendered in all formats, but 
> > powerpoint is missing from that list. I've consulted the release notes 
> > too, and there doesn't appear any mention of Math in Powerpoint apart 
> > from the fact that it is passed verbatim now in speaker notes.
> >
> > Thanks,
> >
> > Sukil
> >
> >
> > El 01/07/2022 a las 10:42, Yibotg escribió:
> >> Hi, I used pandoc 2.18 to convert markdown to docx and pptx.
> >>
> >> $\sqrt{x}$ in md was convert two different equations in docx and pptx:
> >>
> >> the docx was OK,but the pptx had a blank square on the left of root 
> sign.
> >>
> >> How can I get the docx equation in pptx?
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