82/68 =41/34 (se simplifica cu 2)
39/45=13/15 (se simplifica cu 3)
2013/4056=671/1352 (se simplifica cu 3)
30/77 ireductibila
535353/353535 =178451/117845=25493/16835=1961/1295=53/35 se simplifica cu3 ;7;13;37)
4⁵⁰/8²⁵=(2²)⁵⁰/(2³)²⁵=2¹⁰⁰/2⁷⁵=2²⁵ (se simplifica cu 2⁷⁵)
27²⁰¹³/32²⁰¹³ ireductibila
3*6*9*...*2013\5*10*15*...*2015
se simplifica cu :(3*6*9*...*402)
3 (3/15)
6 (6/30)
9 (9/45)
12 (12/60)
15 (15/75)
si asa mai departe pana la 402 (402/2010)