1. 39/15-7/3= amplificam cu 5 al doilea termen
(39-35)15=
=4/15
31/18-4/9=
amplificam cu 2 al doilea termen
=(31-8)/18
=23/18
3. 8 11/24-6 2/3= introducem intregii in fractie
=(8×24+11)/24- (6×3+2)/3
amplificam cu 8 al doilea termen
=203/24- (20×8)/24
=43/24
4. 6 1/18-3 1/3=
introducem intregii in fractie
(6×18+1)/18-(3×3+1)/3
=(108+1)/18-(3×3+1)/3
=109/18-10/3
amplificam cu 6 al doilea termen
=(109-60)/18=49/18
=49/18
5. 13/75-3/50=pentru a aduce la acelasi numitor , amplificam primul termen cu 2
si al doilea termen cu 3
=(13×2)/150-(3×3)/150=(26-9)/150
=15/150
=1/10
6.
7 11/45-5 7/30=introducem intregii in fractie
=(7×45+11)/45- (5×30+7)/30
=315/45-(157)/30
=amplificam primul termen cu 2, al doilea cu 3
=(315×2-157×3)/90
=(630-471)90
=159/90
=53/30
