(6−312−6)\left(\begin{array}{rr}6 & -3 \\12 & -6\end{array}\right)(612−3−6)
(63126)\left(\begin{array}{rr}6 & 3 \\12 & 6\end{array}\right)(61236)
(4−284)\left(\begin{array}{rr}4 & -2 \\8 & 4\end{array}\right)(48−24)
(−24−46)\left(\begin{array}{rr}-2 & 4 \\-4 & 6\end{array}\right)(−2−446)
