\[\boxed{\mathbf{Проверьте\ себя.\ Страница\ 89}}\]
\[\boxed{\mathbf{Проверочная\ работа.\ Подобные\ слагаемые}}\]
\[\boxed{\text{1.}}\]
\[Ответ:а).\]
\[\boxed{\text{2.}}\]
\[\boxed{\text{3.}}\]
\[\frac{2}{5}m + \frac{2}{15}m - \frac{1}{3}m =\]
\[= \frac{6}{15}m + \frac{2}{15}m - \frac{5}{15}m =\]
\[= \frac{3}{15}m = \frac{1}{5}m\]
\[m = 1\frac{2}{13} = \frac{15}{13}:\]
\[\frac{1}{5} \cdot \frac{15}{13} = \frac{5}{13}.\]
\[\boxed{\text{4.}}\]
\[\textbf{а)}\ 4x - 6x - 3x + 7 + x = 0,1\]
\[- 3x = 0,1 - 7\]
\[- 3x = - 6,9\]
\[x = 6,9\ :3\]
\[x = 2,3.\]
\[\textbf{б)}\ 5x + x - 3x - 7x - 6 = 7\]
\[- 4x = 7 + 6\]
\[- 4x = 13\]
\[x = 13\ :( - 4)\]
\[x = - \frac{13}{4} = - 3\frac{1}{4}\]
\[x = - 1,25.\ \]
Глава 40. Решение уравнений