Решебник по математике 6 класс Мерзляк ФГОС Задание 1152

 

\[\boxed{\mathbf{1152\ (1144)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]

\[1)\ 3x = 28 - x\]

\[3x + x = 28\]

\[4x = 28\]

\[x = 7\]

\[Ответ:7.\]

\[2)\ 5x + 12 = 8x + 30\]

\[8x - 5x = 12 - 30\]

\[3x = - 18\]

\[x = - 6\]

\[Ответ:\ - 6.\]

\[3)\ 33 + 8x = - 5x + 72\]

\[8x + 5x = 72 - 33\]

\[13x = 39\]

\[x = 3\]

\[Ответ:3.\]

\[4)\ 6x - 19 = - x - 10\]

\[6x + x = - 10 + 19\]

\[7x = 9\]

\[x = \frac{9}{7} = 1\frac{2}{7}\]

\[Ответ:1\frac{2}{7}.\]

\[5)\ 0,7 - 0,2x = 0,3x - 1,8\]

\[0,3x + 0,2x = 0,7 + 1,8\]

\[0,5x = 2,5\]

\[x = 5\]

\[Ответ:5.\]

\[6)\ 0,1x + 9 = 0,2x - 4\]

\[0,2x - 0,1x = 9 + 4\]

\[0,1x = 13\]

\[x = 130\]

\[Ответ:130.\]