[Tex/LaTex] How to write the fraction on two line

math-mode

I want to write the fraction on two line in LaTeX like this.

enter image description here

how to make it please?

Regards ,

Best Answer

There is the \splitfrac command, from mathtools, which is precisely designed for that:

\documentclass[a4paper, 12pt]{report}
\usepackage[utf8]{inputenc}
\usepackage[showframe]{geometry}
\usepackage{mathtools}


\begin{document}

\mbox{}
\begin{equation}
    A = \left\{\varepsilon_G b +\dfrac{\varepsilon_{HG} bK[H]_t}{\splitfrac{1+0.5\big(-(1-K[G]_t +K[H]_t)}{ + √{(1-K[G]_t +K[H]_t)² + 4K[G]_t}\big)}}\right\}%
  \end{equation}

\end{document} 

enter image description here

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