Code: Select all
\documentclass[10pt,letter,english]{article}
\usepackage[top=14mm, bottom=14mm, left=28mm, right=28mm]{geometry}
\usepackage{array}
\begin{document}
\begin{minipage}{\linewidth}
\setlength{\extrarowheight}{6mm}
\begin{tabular}{@{\hspace{0mm}}l@{\hspace{4mm}}r@{\hspace{10mm}}r@{\hspace{6mm}}r}
1. $\displaystyle \frac{1}{(1-x)}$, & $x=3,5,7$ & 2. $\displaystyle\frac{1}{1+x},$ & $x=3,5,7$\\
3. $\displaystyle \sqrt{1+x}$, & $x=3,5,7$ & 4. $\displaystyle\sqrt[3]{1-x},$ & $x=3,5,7$\\
\end{tabular}
\end{minipage}
\end{document}