I'm typesetting a subsection of exercises using array
environment. However, the vertical centers of exercise numbers do not align with the display style fraction bars (see the following figure). Other methods not using array
are welcome, but please take into account that the vertical space between different rows can be changed (e.g. \renewcommand{\arraystretch}{0.5}
in my code). I would appreciate any help with this situation.
\documentclass[a5paper,12pt]{book}
\usepackage[top=1.5cm,bottom=2cm,includehead=true,inner=2cm,outer=1.8cm]{geometry}
\usepackage{amsmath,amsthm,amssymb}
\usepackage{array}
\begin{document}
\chapter{Chap}
\section{Sec}
text text text text text text text text text text text text text text text text text text text text text text text text text
\subsection{Exercise}
\begin{equation*}
\renewcommand{\arraystretch}{0.5}
\begin{array}{r@{\enspace } >{$\displaystyle}m{4.4cm}<{$} r@{\enspace } >{$\displaystyle}m{4.4cm}<{$}}
1. & {\frac{1}{2}}+{\frac{1}{5}}= & 2. & {\frac{3}{4}}+{\frac{5}{8}}= \\
& & & \\
3. & {\frac{7}{9}}+{\frac{16}{21}}= & 4. & {\frac{5}{6}}+{\frac{11}{14}}= \\
& & & \\
5. & {\frac{15}{22}}+{\frac{11}{26}}= & 6. & {\frac{103}{10}}+8{\frac{5}{16}}= \\
\end{array}
\end{equation*}
\end{document}