306 + 29 + 486 = 821
163 + 163 + 163 = 489
1000 − 625 = 375
700 − 196 = 504
(365 + 195) − 289 = 271
956 − (483 + 206) = 267
58 + 165 + 438 = 661
(625 + 75) − 700 = 0
Вычисления:
306 + 29 + 486 = 335 + 486 = 821
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}306\\ 29\end{array}}\\ \begin{array}{r}335\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}335\\ 486\end{array}}\\ \begin{array}{r}821\end{array}\end{array}$
163 + 163 + 163 = 326 + 163 = 489
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}163\\ 163\end{array}}\\ \begin{array}{r}326\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}326\\ 163\end{array}}\\ \begin{array}{r}489\end{array}\end{array}$
1000 − 625 = 375
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}1000\\ 625\end{array}}\\ \begin{array}{r}375\end{array}\end{array}$
700 − 196 = 504
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}700\\ 196\end{array}}\\ \begin{array}{r}504\end{array}\end{array}$
(365 + 195) − 289 = 560 − 289 = 271
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}365\\ 195\end{array}}\\ \begin{array}{r}560\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}560\\ 289\end{array}}\\ \begin{array}{r}271\end{array}\end{array}$
956 − (483 + 206) = 956 − 689 = 267
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}483\\ 206\end{array}}\\ \begin{array}{r}689\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}956\\ 689\end{array}}\\ \begin{array}{r}267\end{array}\end{array}$
58 + 165 + 438 = 223 + 438 = 661
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}58\\ 165\end{array}}\\ \begin{array}{r}223\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}223\\ 438\end{array}}\\ \begin{array}{r}661\end{array}\end{array}$
(625 + 75) − 700 = 700 − 700 = 0
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}625\\ 75\end{array}}\\ \begin{array}{r}700\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}700\\ 700\end{array}}\\ \begin{array}{r}0\end{array}\end{array}$