(2,4 + x) * 18 = 61,2
2,4 + x = 61,2 : 18
2,4 + x = 3,4
x = 3,4 − 2,4
x = 1
Ответ: 1

Вычисления:
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}\mathrm{61,2}\\ \phantom{0}\underset{¯}{54}\\ \phantom{0}\underset{¯}{\phantom{0}}72\\ \phantom{00}\underset{¯}{72}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)18}\\ \overline{\overline{)\mathrm{3,4}}}\end{array}\end{array}$

(6,3 − x) * 15 = 3,3
6,3 − x = 3,3 : 15
6,3 − x = 0,22
x = 6,3 − 0,22
x = 6,08
Ответ: 1

Вычисления:
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}\mathrm{3,3}\\ \phantom{0}\underset{¯}{30}\\ \phantom{0}\underset{¯}{\phantom{0}}30\\ \phantom{00}\underset{¯}{30}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)15}\\ \overline{\overline{)\mathrm{0,22}}}\end{array}\end{array}$
 
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}\mathrm{6,30}\\ \mathrm{0,22}\end{array}}\\ \begin{array}{r}\mathrm{6,08 }\end{array}\end{array}$

(5,12 + x) * 0,14 = 8,4
5,12 + x = 8,4 : 0,14
5,12 + x = 60
x = 60 − 5,12
x = 54,88
Ответ: 54,88

Вычисления:
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}840\\ \phantom{0}\underset{¯}{84}\\ \phantom{00}\underset{¯}{\phantom{0}}0\\ \phantom{000}\underset{¯}{0}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)14}\\ \overline{\overline{)60}}\end{array}\end{array}$
 
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}\mathrm{60,00}\\ \mathrm{5,12}\end{array}}\\ \begin{array}{r}\mathrm{54,88 }\end{array}\end{array}$

(x − 4,7) * 3,4 = 12,92
x − 4,7 = 12,92 : 3,4
x − 4,7 = 3,8
x = 3,8 + 4,7
x = 8,5
Ответ: 8,5

Вычисления:
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}\mathrm{129,2}\\ \phantom{0}\underset{¯}{102}\\ \phantom{0}\underset{¯}{\phantom{0}}272\\ \phantom{00}\underset{¯}{272}\\ \phantom{0000}0\end{array}& \begin{array}{l}\overline{)34}\\ \overline{\overline{)\mathrm{3,8}}}\end{array}\end{array}$
 
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}\mathrm{3,8}\\ \mathrm{4,7}\end{array}}\\ \begin{array}{r}\mathrm{8,5 }\end{array}\end{array}$

2,472 : (30 − y) = 0,12
30 − y = 2,472 : 0,12
30 − y = 20,6
y = 30 − 20,6
y = 9,4
Ответ: 9,4

Вычисления:
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}\mathrm{247,2}\\ \phantom{0}\underset{¯}{24}\\ \phantom{00}\underset{¯}{\phantom{0}}7\\ \phantom{000}\underset{¯}{0}\\ \phantom{00}\underset{¯}{\phantom{0}}72\\ \phantom{000}\underset{¯}{72}\\ \phantom{0000}0\end{array}& \begin{array}{l}\overline{)12}\\ \overline{\overline{)\mathrm{20,6}}}\end{array}\end{array}$
 
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}\mathrm{30,0}\\ \mathrm{20,6}\end{array}}\\ \begin{array}{r}\mathrm{9,4 }\end{array}\end{array}$

12,7 − 4,5x = 8,29
4,5x = 12,7 − 8,29
4,5x = 4,41
x = 4,41 : 4,5
x = 0,98
Ответ: 0,98

Вычисления:
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}\mathrm{12,70}\\ \mathrm{8,29}\end{array}}\\ \begin{array}{r}\mathrm{4,41 }\end{array}\end{array}$
 
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}\mathrm{44,1}\\ \phantom{0}\underset{¯}{405}\\ \phantom{0}\underset{¯}{\phantom{0}}360\\ \phantom{00}\underset{¯}{360}\\ \phantom{0000}0\end{array}& \begin{array}{l}\overline{)45}\\ \overline{\overline{)\mathrm{0,98}}}\end{array}\end{array}$

7x + 5x + 0,28 = 8,92
12x = 8,92 − 0,28
12x = 8,64
x = 8,64 : 12
x = 0,72
Ответ: 0,72

Вычисления:
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}\mathrm{8,92}\\ \mathrm{0,28}\end{array}}\\ \begin{array}{r}\mathrm{8,64 }\end{array}\end{array}$
 
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}\mathrm{8,64}\\ \phantom{0}\underset{¯}{84}\\ \phantom{0}\underset{¯}{\phantom{0}}24\\ \phantom{00}\underset{¯}{24}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)12}\\ \overline{\overline{)\mathrm{0,72}}}\end{array}\end{array}$

17x − 2x − 2,35 = 4,1
15x = 4,1 + 2,35
15x = 6,45
x = 6,45 : 15
x = 0,43
Ответ: 0,43

Вычисления:
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}\mathrm{4,10}\\ \mathrm{2,35}\end{array}}\\ \begin{array}{r}\mathrm{6,45 }\end{array}\end{array}$
 
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}\mathrm{6,45}\\ \phantom{0}\underset{¯}{60}\\ \phantom{0}\underset{¯}{\phantom{0}}45\\ \phantom{00}\underset{¯}{45}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)15}\\ \overline{\overline{)\mathrm{0,43}}}\end{array}\end{array}$

24 * (3x − 5,2) = 0,12
3x − 5,2 = 0,12 : 24
3x − 5,2 = 0,005
3x = 0,005 + 5,2
3x = 5,205
x = 5,205 : 3
x = 1,735
Ответ: 1,735

Вычисления:
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}\mathrm{0,12}\\ \phantom{0}\underset{¯}{0}\\ \underset{¯}{\phantom{0}}120\\ \underset{¯}{120}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)24}\\ \overline{\overline{)\mathrm{0,005}}}\end{array}\end{array}$
 
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}\mathrm{0,005}\\ \mathrm{5,200}\end{array}}\\ \begin{array}{r}\mathrm{5,205 }\end{array}\end{array}$
 
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}\mathrm{5,205}\\ \phantom{0}\underset{¯}{3}\\ \underset{¯}{\phantom{0}}22\\ \phantom{0}\underset{¯}{21}\\ \phantom{0}\underset{¯}{\phantom{0}}10\\ \phantom{000}\underset{¯}{9}\\ \phantom{00}\underset{¯}{\phantom{0}}15\\ \phantom{000}\underset{¯}{15}\\ \phantom{0000}0\end{array}& \begin{array}{l}\overline{)3}\\ \overline{\overline{)\mathrm{1,735}}}\end{array}\end{array}$

7,98 : (2x + 0,18) = 19
2x + 0,18 = 7,98 : 19
2x + 0,18 = 0,42
2x = 0,42 − 0,18
2x = 0,24
x = 0,24 : 2
x = 0,12
Ответ: 0,12

Вычисления:
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}\mathrm{7,98}\\ \phantom{0}\underset{¯}{76}\\ \phantom{0}\underset{¯}{\phantom{0}}38\\ \phantom{00}\underset{¯}{38}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)19}\\ \overline{\overline{)\mathrm{0,42}}}\end{array}\end{array}$
 
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}\mathrm{0,42}\\ \mathrm{0,18}\end{array}}\\ \begin{array}{r}\mathrm{0,24 }\end{array}\end{array}$
 
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}\mathrm{0,24}\\ \phantom{0}\underset{¯}{2}\\ \phantom{0}\underset{¯}{\phantom{0}}4\\ \phantom{00}\underset{¯}{4}\\ \phantom{00}0\end{array}& \begin{array}{l}\overline{)2}\\ \overline{\overline{)\mathrm{0,12}}}\end{array}\end{array}$