Решебник по математике 5 класс Мерзляк ФГОС Задание 489

 

\[\boxed{\ \mathbf{489\ (489)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]

\[1)\ 21 \cdot (18 + x) = 714\]

\[18 + x = 714\ :21\]

\[x = 34 - 18\]

\[x = 16\]

\[Ответ:16.\]

\[2)\ 16 \cdot (4x - 34) = 608\]

\[4x - 34 = 608\ :16\]

\[4x = 38 + 34\]

\[x = 72\ :4\]

\[x = 18\]

\[Ответ:18.\]

\[3)\ 12 \cdot (152 + 19x) = 2052\]

\[152 + 19x = 2052\ :12\]

\[19x = 171 - 152\]

\[x = 19\ :19\]

\[x = 1\]

\[Ответ:1.\]

\[4)\ (152x + 32) \cdot 6 = 192\]

\[152x + 32 = 192\ :6\]

\[152x = 32 - 32\]

\[152x = 0\]

\[x = 0\]

\[Ответ:0.\]