\[\boxed{\mathbf{Страница}\mathbf{\ \ 69}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\boxed{\mathbf{6}\mathbf{.}}\]
\[1)\ 6 \cdot 2 = 12\ (страниц) -\]
\[прочитала\ Яна.\]
\[2)\ 12 - 6 = 6\ (страниц) -\]
\[меньше\ прочитала\ Ира,\ чем\ \]
\[Яна.\]
\[Ответ:на\ 6\ страниц\ меньше.\]
\[\boxed{\mathbf{7}\mathbf{.}}\]
\[1)\ 19 + a = 37\]
\[a = 37 - 19\]
\[a = 18.\]
\[\overline{19 + 18 = 37}\]
\[37 = 37.\]
\[2)\ y - 57 = 94\]
\[y = 94 + 57\]
\[y = 151.\]
\[\overline{151 - 57 = 94}\]
\[94 = 94.\]
\[3)\ 85 - x = 18\]
\[x = 85 - 18\]
\[x = 67.\]
\[\overline{85 - 67 = 18}\]
\[18 = 18.\]
\[\boxed{\mathbf{8}\mathbf{.}}\]
\[(18\ :3 + 43)\ :7 = (6 + 43)\ :7 =\]
\[= 49\ :7 = 7\]
\[(42\ :7 \cdot 9 - 45)\ :3 =\]
\[= (54 - 45)\ :3 = 9\ :3 = 3\]
\[6 \cdot 3\ :2 \cdot 8 - 5 = 9 \cdot 8 - 5 =\]
\[= 72 - 5 = 67\]