Răspuns :
[tex] \frac{54}{72}^{(9} = \frac{6}{8}^{(2} = \frac{3}{4} \\ \\ \frac{120}{540}^{(6} = \frac{20}{90}^{(5} = \frac{4}{18}^{(2} = \frac{2}{9} [/tex]
54 / 72 = ( 54 : 9 ) / ( 72 : 9) = 6 / 8 = ( 6 : 2 ) / ( 8 : 2) = 3 / 4
120 / 540 = ( 120 : 60 ) / ( 540 : 60 ) = 2 / 9