5.388 Сократите дроби 10 12 39 75 21 45, 125, 70, а потом приведите их к знаменателю 30.

Сократим дроби:

• \(\frac{10}{12} = \frac{5}{6}\)
• \(\frac{39}{45} = \frac{13}{15}\)
• \(\frac{75}{125} = \frac{3}{5}\)
• \(\frac{21}{70} = \frac{3}{10}\)

Приведем их к знаменателю 30:

• \(\frac{5}{6} = \frac{5 \times 5}{6 \times 5} = \frac{25}{30}\)
• \(\frac{13}{15} = \frac{13 \times 2}{15 \times 2} = \frac{26}{30}\)
• \(\frac{3}{5} = \frac{3 \times 6}{5 \times 6} = \frac{18}{30}\)
• \(\frac{3}{10} = \frac{3 \times 3}{10 \times 3} = \frac{9}{30}\)

Ответ: \(\frac{25}{30}\), \(\frac{26}{30}\), \(\frac{18}{30}\), \(\frac{9}{30}\)