\[\boxed{Страница\ 40.}\]
\[\boxed{\mathbf{2.}}\]
\[1.\]
\[\textbf{а)}\ c = 60\ :2 = 30\ (ед)\]
\[A(150);\ \ B(300):\]
\[AB = 300 - 150 = 150\ (ед.)\]
\[\textbf{б)}\ c = 32\ :4 = 8\ (ед.)\]
\[M(32);\ \ N(80):\]
\[MN = 80 - 32 = 48\ (ед.)\]
\[\textbf{в)}\ c = 1\ :6 = \frac{1}{6}\ (ед.)\]
\[D\left( \frac{5}{6} \right);\ \ K\left( 2\frac{3}{6} \right):\]
\[DK = 2\frac{3}{6} - \frac{5}{6} = 1\frac{9}{6} - \frac{5}{6} =\]
\[= 1\frac{4}{6}\ (ед.)\]
\[2.\]
\[c = 90\ :6 = 15\ (ед.).\]
\[3.\]
\[5040 \cdot 425\ :70 \cdot 100 =\]
\[= 30\ 600 \cdot 100 = 3\ 060\ 000 -\]
\(нужное\ нам\ число.\)
\[Ответ:число\ 3\ 060\ 000.\]
\[\boxed{\mathbf{3.}}\]
\[2026;\ \ 2037;\ \ 20\ 48;\ \ 2059.\]
\[Ответ:еще\ 4\ таких\ числа.\]