\[\boxed{\mathbf{Страница\ 61.}еуроки - ответы\ на\ пятёрку}\]
\[\boxed{\mathbf{10.}\mathbf{1.}}\]
\[\textbf{а)}\]
\[\textbf{б)}\ \]
\[\boxed{\mathbf{10.2.}}\]
\[\textbf{а)}\ x \cdot 70 = 210\ 350\]
\[x = 210\ 350\ :70\]
\[x = 21\ 035\ :7\]
\[x = 3005.\ \]
\[\textbf{б)}\ 156\ 330\ :y = 386\]
\[y = 156\ 330\ :386\]
\[y = 405.\]
\[\boxed{\mathbf{10.3.}}\]
\[\textbf{а)}\ d - m\ :n\]
\[\textbf{б)}\ (a - b) \cdot (a + b)\ \]
\[\boxed{\mathbf{10.4.}}\]
\[c \cdot 9 > c \cdot 4\]
\[8 \cdot x = x \cdot 8\]
\[a\ :3 > a\ :5\]
\[40\ :b > 32\ :b\]
\[n \cdot (6 \cdot k) < (k \cdot 9) \cdot n\]
\[d \cdot 7 - d \cdot 3 > 2 \cdot d\]
\[\boxed{\mathbf{10.5.}}\]
\[30\ 000\ :50 < 32\ 844\ :42 < 32\ 000\ :40\]
\[600 < 32\ 844\ :42 < 800\]
\[\boxed{\mathbf{10.6.}}\]
\[1\ девочка - 2\ ч;\]
\[120\ :3 = 40\ мин.\]
\[Ответ:\ \ C.\ 40\ мин.\]