Выражения с левой стороны горы:
507 + 17 = 524
235 − 67 = 168
385 + 419 = 804
Выражения с правой стороны горы:
604 + 16 = 620
452 − 83 = 369
279 + 526 = 805
Вычисления:
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}507\\ 17\end{array}}\\ \begin{array}{r}524\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}235\\ 67\end{array}}\\ \begin{array}{r}168\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}385\\ 419\end{array}}\\ \begin{array}{r}804\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}604\\ 16\end{array}}\\ \begin{array}{r}620\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}452\\ 83\end{array}}\\ \begin{array}{r}369\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}279\\ 526\end{array}}\\ \begin{array}{r}805\end{array}\end{array}$