(64 + 36) * 8 = 800
(32 + 48) * 4 = 320
(129 − 109) * 6 = 180
7 * (95 − 15) = 560
Вычисления:
(64 + 36) * 8 = 100 * 8 = 10 * 10 * 8 = 80 * 10 = 800
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}64\\ 36\end{array}}\\ \begin{array}{r}100\end{array}\end{array}$
(32 + 48) * 4 = 80 * 4 = 8 * 10 * 4 = (8 * 4) * 10 = 32 * 10 = 320
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}32\\ 48\end{array}}\\ \begin{array}{r}80\end{array}\end{array}$
(129 − 109) * 6 = 20 * 6 = 2 * 10 * 6 = (2 * 6) * 10 = 12 * 10 = 120
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}129\\ 109\end{array}}\\ \begin{array}{r}20\end{array}\end{array}$
7 * (95 − 15) = 7 * 80 = 7 * 8 * 10 = 56 * 10 = 560
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}95\\ 15\end{array}}\\ \begin{array}{r}80\end{array}\end{array}$