[ab/2−c/3]\left[\begin{array}{c}\mathrm{a} \\\mathrm{b} / 2 \\-\mathrm{c} /3\end{array}\right]ab/2−c/3
[−ab/2c/3]\left[\begin{array}{c}-a \\b / 2 \\c / 3\end{array}\right]−ab/2c/3
[a−b/2c/3]\left[\begin{array}{c}a \\-b / 2 \\c / 3\end{array}\right]a−b/2c/3
[−a−b−c]\left[\begin{array}{l}-a \\-b \\-c\end{array}\right]−a−b−c
−[−ab2c/3]-\left[\begin{array}{l}-a \\b 2 \\c / 3\end{array}\right]−−ab2c/3