\documentclass[a5]{article} \begin{document} \[ A = \left( \begin{array}{ccc} a & b & c \\ d & e & f \\ g & h & i \end{array} \right) \] \end{document}
\documentclass[a5]{article} \begin{document} \[ A = \left( \begin{array}{rrr} -1 & 20 & 3 \\ 4 & -5 & 600 \\ 7 & 8 & -9 \end{array} \right) \] \end{document}
\[ \mathrm{det}A = |A| = \left| \begin{array}{ccc} a_{11} & a_{12} & a_{13} \\ a_{21} & a_{22} & a_{23} \\ a_{31} & a_{32} & a_{33} \end{array} \right| \]
$ platex hogehoge.tex
$ dvipng -T tight -bg Transparent hogehoge.dvi
$ dvipdfmx hogehoge.dvi hogehoge.pdf