\[\boxed{Страница\ 68.}\]
\[\boxed{\mathbf{2.}}\]
\[1.\]
\[60\ :(14 + 16) = 60\ :30 =\]
\[= 2\ (ч) - лыжники\ встретятся.\]
\[Ответ:через\ 2\ ч.\]
\[2.\]
\[\textbf{а)}\ (a + b) \cdot 4\]
\[\textbf{б)}\ c - (a + b) \cdot 2\]
\[\textbf{в)}\ (a + b) \cdot 4\]
\[\textbf{г)}\ c + (a + b) \cdot 3\]
\[3.\]
\[= 7080\]
\[1)\ 6049 - 385 = 5664\]
\[2)\ 25\ 704\ :306 = 84\]
\[3)\ 4236 + 84 = 4320\]
\[4)\ 5664 \cdot 5400 = 30\ 585\ 600\]
\[5)\ 30\ 585\ 600\ :4320 = 7080\]
\[\boxed{\mathbf{3.}}\]
\[Ответ:4.\]