Результаты: 75, 42, 36, 1
90 − 15 = 75
90 − 48 = 42
90 − 54 = 36
90 − 89 = 1
Вычисления:
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}90\\ 15\end{array}}\\ \begin{array}{r}75\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}90\\ 48\end{array}}\\ \begin{array}{r}42\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}90\\ 54\end{array}}\\ \begin{array}{r}36\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}90\\ 89\end{array}}\\ \begin{array}{r}1\end{array}\end{array}$