intai aducem fractiile la acelasi numitor comun , amplificandu-le , dupa care calculam.
a). 4/15 + 2/3 =
4/15 + 10/15 = 14/15
am amplificat cu 5 , a 2 a fractie.
b). 16/93 + 6/31 =
16/93 + 18/93 = 34/93
am amplificat a 2 a fractie cu 3.
c). 7/32 - 1/16 =
7/32 - 2/32 = 5/32
ampligici cu 2 , a doua fractie
d). 23/42 - 5/14 =
23/42 - 15/42 = 8/42 = 4/21
amplifici cu 3 , a doua fractie .
8/42 , simplifici cu 2.
/ = inseamna linia de fractie
