(15 + 30) : 9 = 5
(40 − 16) : 4 = 6
8 * 6 − 40 = 8
28 : 4 + 50 = 57
Вычисления:
(15 + 30) : 9 = 45 : 9 = 5
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}15\\ 30\end{array}}\\ \begin{array}{r}45\end{array}\end{array}$
(40 − 16) : 4 = 24 :4 = 6
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}40\\ 16\end{array}}\\ \begin{array}{r}24\end{array}\end{array}$
8 * 6 − 40 = 48 − 40 = 8
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}48\\ 40\end{array}}\\ \begin{array}{r}8\end{array}\end{array}$
28 : 4 + 50 = 7 + 50 = 57