a) \(\frac{17}{20}\)=\(\frac{51}{60}\)
\(\frac{13}{15}\)=\(\frac{52}{60}\)
\(\frac{41}{60}\) giữ nguyên.
b)\(\frac{25}{75}\)=\(\frac{1}{3}\)=\(\frac{4}{12}\)
\(\frac{17}{34}\)=\(\frac{1}{2}\)=\(\frac{6}{12}\)
\(\frac{121}{132}\)=\(\frac{11}{12}\) giữ nguyên.