50 + 6 = 56
40 − 30 = 10
9 + 8 = 17
24 − 4 = 20
49 − 40 = 9
15 + 5 = 20
56 − 1 = 55
30 − 1 = 29
100 − 20 = 80
24 + 5 = 29
60 + 30 = 90
13 − 7 = 6
Вычисления:
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}50\\ 6\end{array}}\\ \begin{array}{r}56\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}40\\ 30\end{array}}\\ \begin{array}{r}10\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}9\\ 8\end{array}}\\ \begin{array}{r}17\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}24\\ 4\end{array}}\\ \begin{array}{r}20\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}49\\ 40\end{array}}\\ \begin{array}{r}9\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}15\\ 5\end{array}}\\ \begin{array}{r}20\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}56\\ 1\end{array}}\\ \begin{array}{r}55\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}30\\ 1\end{array}}\\ \begin{array}{r}29\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}100\\ 20\end{array}}\\ \begin{array}{r}80\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}24\\ 5\end{array}}\\ \begin{array}{r}29\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}60\\ 30\end{array}}\\ \begin{array}{r}90\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}13\\ 7\end{array}}\\ \begin{array}{r}6\end{array}\end{array}$