Условие:

Найди значения выражений.
800 − (9 * 7)
350 + (81 : 9)
438 + 45 + 164 + 291
300 + 427 + 9 + 135

800 − (9 * 7) = 737
350 + (81 : 9) = 359
438 + 45 + 164 + 291 = 938
300 + 427 + 9 + 135 = 871
Вычисления:
800 − (9 * 7) = 800 − 63 = 737
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}800\\ 63\end{array}}\\ \begin{array}{r}737\end{array}\end{array}$
350 + (81 : 9) = 350 + 9 = 359
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}350\\ 9\end{array}}\\ \begin{array}{r}359\end{array}\end{array}$
438 + 45 + 164 + 291 = 483 + 164 + 291 = 647 + 291 = 938
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}438\\ 45\end{array}}\\ \begin{array}{r}483\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}483\\ 164\end{array}}\\ \begin{array}{r}647\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}647\\ 291\end{array}}\\ \begin{array}{r}938\end{array}\end{array}$
300 + 427 + 9 + 135 = 727 + 9 + 135 = 736 + 135 = 871
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}300\\ 427\end{array}}\\ \begin{array}{r}727\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}727\\ 9\end{array}}\\ \begin{array}{r}736\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}736\\ 135\end{array}}\\ \begin{array}{r}871\end{array}\end{array}$