Tìm các phân số bằng nhau trong các phân số sau:
\(\frac{3}{5}\); \(\frac{5}{8}\); \(\frac{15}{25}\); \(\frac{9}{15}\); \(\frac{20}{32}\); \(\frac{21}{35}\).
Ta có:
\(\frac{15}{25}\) = \(\frac{15:5}{25:5}\) = \(\frac{3}{5}\) ;
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\(\frac{20}{32}\) = \(\frac{20:4}{32:4}\) = \(\frac{5}{8}\) ;
\(\frac{9}{15}\) = \(\frac{9:3}{15:3}\) = \(\frac{3}{5}\) ;
\(\frac{21}{35}\) = \(\frac{21:7}{35:7}\) = \(\frac{3}{5}\) ;
Vậy \(\frac{3}{5}\) = \(\frac{15}{25}\) = \(\frac{9}{15}\) = \(\frac{21}{35}\).
\(\frac{5}{8}\) = \(\frac{20}{32}\) ;