49210 : 70 = 703
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}49210\\ \phantom{0}\underset{¯}{490}\\ \phantom{00}\underset{¯}{\phantom{0}}21\\ \phantom{0000}\underset{¯}{0}\\ \phantom{00}\underset{¯}{\phantom{0}}210\\ \phantom{000}\underset{¯}{210}\\ \phantom{00000}0\end{array}& \begin{array}{l}\overline{)70}\\ \overline{\overline{)703}}\end{array}\end{array}$
 
980 * 400 = 392000
$\begin{array}{r}\times \underset{¯}{\begin{array}{r}98\\ 4\end{array}}\\ 392\end{array}$
 
558720 : 9 * 5 − 6140 : 20 = 62080 * 5 − 6140 : 20 = 310400 − 307 = 310093
1) $\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}558720\\ \phantom{0}\underset{¯}{54}\\ \phantom{0}\underset{¯}{\phantom{0}}18\\ \phantom{00}\underset{¯}{18}\\ \phantom{000}\underset{¯}{\phantom{0}}7\\ \phantom{0000}\underset{¯}{0}\\ \phantom{000}\underset{¯}{\phantom{0}}72\\ \phantom{0000}\underset{¯}{72}\\ \phantom{00000}\underset{¯}{\phantom{0}}0\\ \phantom{000000}\underset{¯}{0}\\ \phantom{000000}0\end{array}& \begin{array}{l}\overline{)9}\\ \overline{\overline{)62080}}\end{array}\end{array}$;
2) $\begin{array}{r}\times \underset{¯}{\begin{array}{r}62080\\ 5\end{array}}\\ 310400\end{array}$;
3) $\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}6140\\ \phantom{0}\underset{¯}{60}\\ \phantom{0}\underset{¯}{\phantom{0}}14\\ \phantom{000}\underset{¯}{0}\\ \phantom{0}\underset{¯}{\phantom{0}}140\\ \phantom{00}\underset{¯}{140}\\ \phantom{0000}0\end{array}& \begin{array}{l}\overline{)20}\\ \overline{\overline{)307}}\end{array}\end{array}$;
4) $\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}310400\\ 307\end{array}}\\ \begin{array}{r}310093\end{array}\end{array}$.