И
724 − 358 = 366
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}724\\ 358\end{array}}\\ \begin{array}{r}\mathrm{366 }\end{array}\end{array}$
С
1032 − 465 = 567
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}1032\\ 465\end{array}}\\ \begin{array}{r}\mathrm{567 }\end{array}\end{array}$
К
2729 + 1271 = 4000
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}2729\\ 1271\end{array}}\\ \begin{array}{r}\mathrm{4000 }\end{array}\end{array}$
А
1496 + 2304 = 3800
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}1496\\ 2304\end{array}}\\ \begin{array}{r}\mathrm{3800 }\end{array}\end{array}$
Б
2400 − 544 = 1856
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}2400\\ 544\end{array}}\\ \begin{array}{r}\mathrm{1856 }\end{array}\end{array}$
Т
10000 − 1234 = 8766
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}10000\\ 1234\end{array}}\\ \begin{array}{r}\mathrm{8766 }\end{array}\end{array}$
Р
4512 + 4164 = 8676
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}4512\\ 4164\end{array}}\\ \begin{array}{r}\mathrm{8676 }\end{array}\end{array}$
Е
927 + 919 = 1846
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}927\\ 919\end{array}}\\ \begin{array}{r}\mathrm{1846 }\end{array}\end{array}$

Расшифрованное слово − название луча, выходящего из вершины угла и делящего угол на два равных угла.