Răspuns:
a)2/3+5/6=
Descompunem numitorii
3=3 6=2x3
[3,6]=2x3=6 N.C.=6
6:3=2 6:6=1
Acum amplific fractiile:
Amplific cu 2 fractia 2/3=4/6
Amplific cu 1 fractia 5/6=5/6
4/6+5/6=9/6(adun doar numaratorii)
b)9/20+4/5
Descompunem numitorii:
20=2 la puterea a doua x 5
5=5 x 2 la puterea a doua
[20,5]= 20 N.C.=20
20:20=1 20:5=5
Acum amplific fractiile:
Amplific cu 1 fractia 9/20=9/20
Amplific cu 4 fractia 4/5=16/20
9/20+16/20=25/20
