Решение:
а) \( \frac{1}{2} \) = \( \frac{1 \cdot 36}{2 \cdot 36} \) = \( \frac{36}{72} \);
б) \( \frac{2}{3} \) = \( \frac{2 \cdot 24}{3 \cdot 24} \) = \( \frac{48}{72} \);
в) \( \frac{3}{4} \) = \( \frac{3 \cdot 18}{4 \cdot 18} \) = \( \frac{54}{72} \);
г) \( \frac{5}{6} \) = \( \frac{5 \cdot 12}{6 \cdot 12} \) = \( \frac{60}{72} \);
д) \( \frac{3}{8} \) = \( \frac{3 \cdot 9}{8 \cdot 9} \) = \( \frac{27}{72} \);
е) \( \frac{5}{12} \) = \( \frac{5 \cdot 6}{12 \cdot 6} \) = \( \frac{30}{72} \);
ж) \( \frac{11}{18} \) = \( \frac{11 \cdot 4}{18 \cdot 4} \) = \( \frac{44}{72} \);
з) \( \frac{15}{36} \) = \( \frac{15 \cdot 2}{36 \cdot 2} \) = \( \frac{30}{72} \).