4 * 6 − 5 = 19
36 + 27 : 9 = 39
48 − 42 : 6 + 9 = 49
35 + 50 − 21 : 7 = 82
36 : 6 + 81 : 9 = 15
5 * 8 − 6 * 4 = 16
Вычисления:
4 * 6 − 5 = 24 − 5 = 19
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}24\\ 5\end{array}}\\ \begin{array}{r}19\end{array}\end{array}$
36 + 27 : 9 = 36 + 3 = 39
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}36\\ 3\end{array}}\\ \begin{array}{r}39\end{array}\end{array}$
48 − 42 : 6 + 9 = 48 − 8 + 9 = 40 + 9 = 49
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}48\\ 8\end{array}}\\ \begin{array}{r}40\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}40\\ 9\end{array}}\\ \begin{array}{r}49\end{array}\end{array}$
35 + 50 − 21 : 7 = 35 + 50 − 3 = 85 − 3 = 82
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}35\\ 50\end{array}}\\ \begin{array}{r}85\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}85\\ 3\end{array}}\\ \begin{array}{r}82\end{array}\end{array}$
36 : 6 + 81 : 9 = 6 + 9 = 15
5 * 8 − 6 * 4 = 40 − 24 = 16
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}40\\ 24\end{array}}\\ \begin{array}{r}16\end{array}\end{array}$