Вычисления:
27 + (54 : 9) = 27 + 6 = 33
43 + (87 – 59) = 43 + 28 = 71
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}87\\ 59\end{array}}\\ \begin{array}{r}28\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}43\\ 28\end{array}}\\ \begin{array}{r}71\end{array}\end{array}$
(48 : 6) – 8 = 8 − 8 = 0
(15 + 8) – 11 = 23 − 11 = 12
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}23\\ 11\end{array}}\\ \begin{array}{r}12\end{array}\end{array}$