\(\dfrac{12}{24}=\dfrac{1}{2};\dfrac{12}{39}=\dfrac{1}{3};\dfrac{35}{105}=\dfrac{1}{3};\dfrac{120}{245}=\dfrac{24}{49};\dfrac{134}{402}=\dfrac{39}{67};\)
\(\dfrac{213}{1170}=\dfrac{1}{5};\dfrac{1221}{3663}=\dfrac{1}{3};\dfrac{2133}{33195}=\dfrac{711}{11065}.\)