а) Приведите дробь $\frac{2}{7}$ к знаменателю 14, 21, 35, 140.
б) Приведите дробь $\frac{5}{8}$ к знаменателю 16, 32, 56, 1000.
$\frac{2}{7} = \frac{2 * 2}{7 * 2} = \frac{4}{14}$
$\frac{2}{7} = \frac{2 * 3}{7 * 3} = \frac{6}{21}$
$\frac{2}{7} = \frac{2 * 5}{7 * 5} = \frac{10}{35}$
$\frac{2}{7} = \frac{2 * 20}{7 * 20} = \frac{40}{140}$
$\frac{5}{8} = \frac{5 * 2}{8 * 2} = \frac{10}{16}$
$\frac{5}{8} = \frac{5 * 4}{8 * 4} = \frac{20}{32}$
$\frac{5}{8} = \frac{5 * 7}{8 * 7} = \frac{35}{56}$
$\frac{5}{8} = \frac{5 * 125}{8 * 125} = \frac{625}{1000}$