Решебник по математике 6 класс Мерзляк ФГОС Задание 1153

 

\[\boxed{\mathbf{1153\ (1145)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]

\[1) - 6 \cdot (x + 2) = 4x - 17\]

\[- 6x - 12 = 4x - 17\]

\[4x + 6x = - 12 + 17\]

\[10x = 5\]

\[x = 0,5\]

\[Ответ:0,5.\]

\[2)\ (18x - 19) - (4 - 7x) = - 73\]

\[18x - 19 - 4 + 7x = - 73\]

\[25x = - 73 + 19 + 4\]

\[25x = - 50\]

\[x = - 2\]

\[Ответ:\ - 2.\]

\[3)\ 10x + 3 \cdot (7 - 2x) = 13 + 2x\]

\[10x + 21 - 6x = 13 + 2x\]

\[4x - 2x = 13 - 21\]

\[2x = - 8\]

\[x = - 4\]

\[Ответ:\ - 4.\]

\[4) - 3 \cdot (4 - 5y) +\]

\[+ 2 \cdot (3 - 6y) = - 3,9\]

\[- 12 + 15y + 6 - 12y = - 3,9\]

\[3y = - 3,9 + 2 - 6\]

\[3y = 2,1\]

\[y = 0,7\]

\[Ответ:0,7.\]