ta có
\(\frac{12}{35}\)> \(\frac{12}{36}\)=> \(\frac{12}{35}\)> \(\frac{1}{3}\)
\(\frac{20}{61}\)< \(\frac{20}{60}\)=> \(\frac{20}{61}\) < \(\frac{1}{3}\)
\(\frac{20}{61}\),< \(\frac{1}{3}\) < \(\frac{12}{35}\)
vậy \(\frac{20}{61}\) < \(\frac{12}{35}\)