\documentclass[12pt]{report}
\usepackage{amsmath}
\begin{document}
\[
\begin{array}{l}
\frac{1}{2}
 \frac{\frac{1}{2}}{3}
 \frac{1}{\frac{1}{2}}
 \frac{\int_1^8 f(x) dx}{2}
 \\
 \frac{1}{2}
 \frac{\frac{1}{2}}{3}
 \frac{1}{\frac{1}{2}}
 \frac{\int_1^8 f(x) dx}{2}
\end{array}
\]
 
 \vspace*{20mm}
 
\begin{align*}
&  \frac{1}{2}
 \frac{\frac{1}{2}}{3}
 \frac{1}{\frac{1}{2}}
 \frac{\int_1^8 f(x) dx}{2}
 \\
&
\frac{1}{2}
 \frac{\frac{1}{2}}{3}
 \frac{1}{\frac{1}{2}}
 \frac{\int_1^8 f(x) dx}{2} 
\end{align*}

\end{document}