a) 2n+3/3n+4
Presupunem ca au un divizor comun "d":
d /2n+3⇒d /6n+9
d/ 3n+4⇒d/6n+8
Scadem:d/1⇒fractie ireductibila
Singurul numar care se divide cu 1 este chiar 1.
Am folosit proprietatile :Daca d/a si d/b ,atunci d/a-b.
Daca d/a⇒ d/a*k ,k∈N
Celelalte se fac analog:
b)2n+7/n+3
d/2n+7⇒d/2n+7
d/n+3 ⇒d/2n+6
Scadem: d/1⇒fractie ireductibila.
c)2n+3/5n+7
d/2n+3⇒d/10n+15
d/5n+7⇒d/10n+14
Scadem: d/1⇒fractie ireductibila
d)3n+7/5n+12
d/5n+12⇒d/15n+36
d/3n+7 ⇒d/15n+35
Scadem:d/1 ⇒fractie ireductibila