(1−407)\left(\begin{array}{cc} 1 & -4 \\ 0 & 7 \end{array}\right)(10−47)
(−1−407)\left(\begin{array}{cc} -1 & -4 \\ 0 & 7 \end{array}\right)(−10−47)
(1−409)\left(\begin{array}{cc} 1 & -4 \\ 0 & 9 \end{array}\right)(10−49)
(0−408)\left(\begin{array}{cc} 0 & -4 \\ 0 & 8 \end{array}\right)(00−48)