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This question already has an answer here:

enter image description here

How can make a continued fraction in the previous format?

marked as duplicate by Heiko Oberdiek, Stefan Pinnow, user13907, barbara beeton, Maarten Dhondt Nov 16 '16 at 16:37

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\documentclass{article}
\newcommand\contfrac[2]{\underline{#1}/\overline{#2}}
\begin{document}
\[
\Phi^{n,n}(x) = f_0 + \contfrac{x-x_0}{\phi(x_0,x_1)} +
  \contfrac{x-x_1}{\phi(x_0,x_1,x_2)} + \cdots
\]
\end{document}

enter image description here

  • Note that this approach will automatically work in the smaller math styles, as well. – Steven B. Segletes Nov 16 '16 at 16:10

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