97 − 23 = 74
78 − 23 = 55
88 − 23 = 65
69 − 23 = 46
Вычисления:
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}97\\ 23\end{array}}\\ \begin{array}{r}74\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}78\\ 23\end{array}}\\ \begin{array}{r}55\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}88\\ 23\end{array}}\\ \begin{array}{r}65\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}69\\ 23\end{array}}\\ \begin{array}{r}46\end{array}\end{array}$