3x = 1
x = 1 : 3
x ≈ 0,3
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}1\\ \phantom{0}\underset{¯}{0}\\ \underset{¯}{\phantom{0}}10\\ \phantom{00}\underset{¯}{9}\\ \phantom{0}\underset{¯}{\phantom{0}}10\\ \phantom{000}\underset{¯}{9}\\ \phantom{000}1\text{...}\end{array}& \begin{array}{l}\overline{)3}\\ \overline{\overline{)\mathrm{0,33...}}}\end{array}\end{array}$
Ответ: x ≈ 0,3

9 : x = 22
x = 9 : 22
x ≈ 0,4
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}9\\ \phantom{0}\underset{¯}{0}\\ \underset{¯}{\phantom{0}}90\\ \phantom{0}\underset{¯}{88}\\ \phantom{0}\underset{¯}{\phantom{0}}20\\ \phantom{000}\underset{¯}{0}\\ \phantom{00}20\text{...}\end{array}& \begin{array}{l}\overline{)22}\\ \overline{\overline{)\mathrm{0,40...}}}\end{array}\end{array}$
Ответ: x ≈ 0,4

$2\frac{1}{6}x=\frac{5}{12}$
$\frac{13}{6}x=\frac{5}{12}$
$x=\frac{5}{12}:\frac{13}{6}$
$x=\frac{5}{12}\ast <!--\; \ast \; -->\frac{6}{13}$
$x=\frac{5}{2}\ast <!--\; \ast \; -->\frac{1}{13}$
$x=\frac{5}{26}$
x ≈ 0,2
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}5\\ \phantom{0}\underset{¯}{0}\\ \underset{¯}{\phantom{0}}50\\ \phantom{0}\underset{¯}{26}\\ \underset{¯}{\phantom{0}}240\\ \phantom{0}\underset{¯}{234}\\ \phantom{000}6\text{...}\end{array}& \begin{array}{l}\overline{)26}\\ \overline{\overline{)\mathrm{0,19...}}}\end{array}\end{array}$
Ответ: x ≈ 0,2