$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}73428\\ 8434\end{array}}\\ \begin{array}{r}81862\end{array}\end{array}$
 
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}83726\\ 4367\end{array}}\\ \begin{array}{r}79359\end{array}\end{array}$
 
$\begin{array}{r}\begin{array}{r}\times \end{array}\underline{\begin{array}{r}3784\\ 7\end{array}}\\ \begin{array}{r}26488\end{array}\end{array}$
 
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}5658\\ \phantom{0}\underset{¯}{54}\\ \phantom{0}\underset{¯}{\phantom{0}}25\\ \phantom{00}\underset{¯}{24}\\ \phantom{00}\underset{¯}{\phantom{0}}18\\ \phantom{000}\underset{¯}{18}\\ \phantom{0000}0\end{array}& \begin{array}{l}\overline{)6}\\ \overline{\overline{)943}}\end{array}\end{array}$
 
(1800 − 1500) : 6 + 140 * 5 = 300 : 6 + 140 * 5 = 50 + 700 = 750