Решение задания 26.

a) \( \frac{7}{9} = \frac{140}{180} \), b) \( \frac{1}{4} = \frac{45}{180} \), c) \( \frac{2}{3} = \frac{120}{180} \), d) \( \frac{5}{18} = \frac{50}{180} \).