16 * 12 + 34 * 17 − 28 * 20 = 210
909 : 9 − (520 − 502) * 13 : 6 = 62
755 : 5 + 18 * 18 − (89 − 73) * 19 = 171
(22 * 44 − 11 * 20 − 10 * 10) : 8 = 81
Вычисления:
16 * 12 + 34 * 17 − 28 * 20 = 210
1)

2)

3)

4)
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}192\\ 578\end{array}}\\ \begin{array}{r}770\end{array}\end{array}$
5)
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}770\\ 560\end{array}}\\ \begin{array}{r}210\end{array}\end{array}$
909 : 9 − (520 − 502) * 13 : 6 = 62
1)
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}520\\ 502\end{array}}\\ \begin{array}{r}18\end{array}\end{array}$
2)

3)
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}234\\ \phantom{0}\underset{¯}{18}\\ \phantom{0}\underset{¯}{\phantom{0}}54\\ \phantom{00}\underset{¯}{54}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)6}\\ \overline{\overline{)39}}\end{array}\end{array}$
4)
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}909\\ \phantom{0}\underset{¯}{9}\\ \phantom{0}\underset{¯}{\phantom{0}}0\\ \phantom{00}\underset{¯}{0}\\ \phantom{00}\underset{¯}{\phantom{0}}9\\ \phantom{000}\underset{¯}{9}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)9}\\ \overline{\overline{)101}}\end{array}\end{array}$
5)
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}101\\ 39\end{array}}\\ \begin{array}{r}62\end{array}\end{array}$
755 : 5 + 18 * 18 − (89 − 73) * 19 = 171
1)
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}89\\ 73\end{array}}\\ \begin{array}{r}16\end{array}\end{array}$
2)

3)
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}755\\ \phantom{0}\underset{¯}{5}\\ \underset{¯}{\phantom{0}}25\\ \phantom{0}\underset{¯}{25}\\ \phantom{00}\underset{¯}{\phantom{0}}5\\ \phantom{000}\underset{¯}{5}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)5}\\ \overline{\overline{)151}}\end{array}\end{array}$
4)

5)
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}151\\ 324\end{array}}\\ \begin{array}{r}475\end{array}\end{array}$
6)
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}475\\ 304\end{array}}\\ \begin{array}{r}171\end{array}\end{array}$
(22 * 44 − 11 * 20 − 10 * 10) : 8 = 81
1)

2)

3)

4)
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}968\\ 220\end{array}}\\ \begin{array}{r}748\end{array}\end{array}$
5)
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}748\\ 100\end{array}}\\ \begin{array}{r}648\end{array}\end{array}$
6)
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}648\\ \phantom{0}\underset{¯}{64}\\ \phantom{00}\underset{¯}{\phantom{0}}8\\ \phantom{000}\underset{¯}{8}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)8}\\ \overline{\overline{)81}}\end{array}\end{array}$