Условие:

Вычисли.
(45 + 38) − 54
96 − (63 − 36)
(100 − 67) + 15
74 + (8 + 18)

(45 + 38) − 54 = 29
96 − (63 − 36) = 69
(100 − 67) + 15 = 48
74 + (8 + 18) = 100
Вычисления:
(45 + 38) − 54 = 83 − 54 = 29
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}45\\ 38\end{array}}\\ \begin{array}{r}83\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}83\\ 54\end{array}}\\ \begin{array}{r}29\end{array}\end{array}$
96 − (63 − 36) = 96 − 27 = 69
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}63\\ 36\end{array}}\\ \begin{array}{r}27\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}96\\ 27\end{array}}\\ \begin{array}{r}69\end{array}\end{array}$
(100 − 67) + 15 = 33 + 15 = 48
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}100\\ 67\end{array}}\\ \begin{array}{r}33\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}33\\ 15\end{array}}\\ \begin{array}{r}48\end{array}\end{array}$
74 + (8 + 18) = 74 + 26 = 100
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}8\\ 18\end{array}}\\ \begin{array}{r}26\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}74\\ 26\end{array}}\\ \begin{array}{r}100\end{array}\end{array}$