Câu trả lời:

\(a.\frac{1}{2}=\frac{15}{30};\frac{1}{3}=\frac{10}{30};\frac{1}{5}=\frac{6}{30}\)\(b.\frac{2}{3}=\frac{16}{24};\frac{3}{4}=\frac{18}{24};\frac{5}{8}=\frac{15}{24}\)