ГДЗ по математике 6 класс Дорофеев Задание 923

\[\boxed{\mathbf{923\ (923)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]

\[\textbf{а)}\ x + 21 = 7\]

\[x = 7 - 21\]

\[x = - (21 - 7)\]

\[x = - 14.\]

\[Ответ:x = - 14.\]

\[\textbf{б)}\ 32 + x = - 25\]

\[x = - 25 - 32\]

\[x = - (25 + 32)\]

\[x = - 57.\]

\[Ответ:x = - 57.\]

\[\textbf{в)}\ x + 12,5 = - 7,5\]

\[x = - 7,5 - 12,5\]

\[x = - (7,5 + 12,5)\]

\[x = - 20.\]

\[Ответ:x = - 20.\]

\[\textbf{г)}\ 15,2 + x = 2,3\]

\[x = 2,3 - 15,2\]

\[x = - (15,2 - 2,3)\]

\[x = - 12,9.\ \]

\[Ответ:\ \ x = - 12,9.\]