Adjusting vertical spacing in fractions?
You can use \cfrac
, which is thought for continued fractions, which this is a case of:
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{equation*}
t =
\frac{\dfrac{T_1}{T_2}}{1+\dfrac{Q_1}{Q_2}}=
\cfrac{\cfrac{T_1}{T_2}}{1+\cfrac{Q_1}{Q_2}}
\end{equation*}
\end{document}
I would use inline-fraction notation rather than stack two \dfrac
expressions. The presence of the /
characters ensures almost automatically that the numerator and denominator terms are not placed too closely to the fraction bar.
\documentclass{article}
\usepackage{amsmath} % for "\dfrac" macro and "equation*" env.
\begin{document}
\begin{equation*}
t=\dfrac{T_1/T_2}{1+Q_1/Q_2}
\end{equation*}
\end{document}
Use\cfrac, combined with \bigstrut
for the numerator:
\documentclass{article}
\usepackage{amsmath}
\usepackage{bigstrut}
\begin{document}
\begin{equation*}
t = \frac{\cfrac{T_1}{T_2\bigstrut[b]}}{1+\cfrac{Q_1}{Q_2}}
\end{equation*}
\end{document}