Răspuns :
a) 123/31 : ( 17/18 × 18/17 ) =
= 123/31 : 1 = 123/31
b) 39/45 : ( 107/189 × 189/107 ) =
= 39/45 : 1 = 39/45
= 123/31 : 1 = 123/31
b) 39/45 : ( 107/189 × 189/107 ) =
= 39/45 : 1 = 39/45