$\rm a)\\\left.\begin{array}{l}1\,2\,9\,6\\ 1\,2\,0\\\hline \ \,\,\,\;\;9\,6\\\,\,\quad9\,6\\\hline\qquad0\end{array}\right|\!\!\!\;\!\!\begin{array}{l}\dfrac{\ \ 2\,4\ \ }{\ \ 5\,4\ \ }\\\\\\\end{array}$$\\$ $\rm b)\\\left.\begin{array}{l}\;1\,8\,0\\ \ 1\,8\,0\\\hline\quad\,\;\,0\\\\\end{array}\right|\!\!\!\;\!\!\begin{array}{l}\dfrac{\ \ 3\,6\ \ }{\ \ 5\ \ }\\\\\\\end{array}$ $\\$$\rm c)\\\left.\begin{array}{l}3\,7\,5\,8\,4\\ \ \,\,2\,7\,8\\\,\,\,\,\,\,\;4\,6\,4\\\qquad0\end{array}\right|\!\!\!\;\!\!\begin{array}{l}\dfrac{\ \ 5\,8\ \ }{\ \ 6\,4\,8\ \ }\\\\\\\end{array}$$\\$\(\rm{d)}\\\left.\begin{array}{l}8\,5\,4\,9\,1\\ 2\,2\,4\\\,\,\,\,3\,5\,9\\\quad\,\, 4\,4\,1\\\qquad \,\,\,\,0\end{array}\right|\!\!\!\;\!\!\begin{array}{l}\dfrac{\ \ 6\,3\ \ }{\ \ 1\,3\,5\,7\ \ }\\\\\\\end{array}\) $\\$\(\rm {e)}\\\left.\begin{array}{l}4\,9\,9\,2\,0\,6\,5\\ \ \,\,7\,4\,2\\\,\,\,\,\,\,\;6\,2\,0\\\qquad2\,5\,6\\\qquad\quad\,\,1\,5\end{array}\right|\!\!\!\;\!\!\begin{array}{l}\dfrac{\ \ 8\,5\ \ }{\ \ 5\,8\,7\,3\,0\ \ }\\\\\\\end{array}\) $\\$\(\rm{f)}\\\left.\begin{array}{l}2\,5\,7\,8\\ \ \;\;\;\,1\,8\,0\\\,\,\quad\,\,\;2\,0\,0\\\qquad\quad\,\,8\end{array}\right|\!\!\!\;\!\!\begin{array}{l}\dfrac{\ \ 3\,2\ \ }{\ \ 8\,0,5\,6\ \ }\\\\\\\end{array}\) $\\$ \(\rm{g)}\\\left.\begin{array}{l}5\,0\,1\,6\,7\\ \ \,\;7\,1\\\,\,\,\;2\,8\,6\\\quad\,\;2\,8\,7\\\qquad\,2\,9\end{array}\right|\!\!\!\;\!\!\begin{array}{l}\dfrac{\ \ 4\,3\ \ }{\ \ 1\,1\,6\,6\ \ }\\\\\\\end{array}\)