\[\boxed{\mathbf{Страница\ 37.}еуроки - ответы\ на\ пятёрку}\]
\[\boxed{\mathbf{4.}}\]
\[\boxed{\mathbf{5.}}\]
\[600 - (x\ :6 - 75) \cdot 30 = 150\]
\[(x\ :6 - 75) \cdot 30 = 600 - 150\]
\[(x\ :6 - 75) \cdot 30 = 450\]
\[x\ :6 - 75 = 450\ :30\]
\[x\ :6 - 75 = 15\]
\[x\ :6 = 15 + 75\]
\[x\ :6 = 90\]
\[x = 90 \cdot 6\]
\[x = 540.\]
\[\boxed{\mathbf{6.}}\]
\[Равны:\]
\[\boxed{\mathbf{7.}}\]
\[Ответ:D.\ 7.\]