\[Страница\ 10.\]
\[\boxed{\mathbf{9.}}\]
\[\textbf{а)}\ 24\ 000\ :80 = 300 \cdot 7 =\]
\[= 2100\ :5 = 420 + 80 = 500\]
\[\textbf{б)}\ 19\ 000 + 11\ 000 =\]
\[= 30\ 000\ :600 = 50 \cdot 80 =\]
\[= 400 + 600 = 1000\]
\[\textbf{в)}\ 63\ 000 - 45\ 000 =\]
\[= 18\ 000\ :600 = 30 \cdot 320 =\]
\[= 9600 + 400 = 10\ 000\]
\[\textbf{г)}\ 40\ 000 - 22\ 900 =\]
\[= 17\ 100\ :900 = 19 \cdot 140 =\]
\[= 2660 + 520 = 3180\]
\[\textbf{д)}\ 4800\ :80 = 60\ :3 =\]
\[= 20 \cdot 20 = 400 - 131 = 269\]
\[\textbf{е)}\ 15\ 000\ :6 = 2500 \cdot 4 =\]
\[= 10\ 000\ :5 = 2000 \cdot 7 =\]
\[= 14\ 000\]
\[24.\ Сравнение\ дробей\]
\[\boxed{\mathbf{1.}}\]
\[\textbf{а)}\ \frac{5}{8} > \frac{3}{8}\]
\[\textbf{б)}\ \frac{3}{5} < \frac{4}{6}\ \]
\[\textbf{в)}\ \frac{4}{6} < \frac{5}{6}\]
\[\textbf{г)}\ \frac{5}{12} < \frac{10}{18}\]