exercitiu 1 de la efectuați
va rogg
dau coronița la primul

a) 23/4 - 5/4 = 18/4 = 9/2
b) 13/5 - 11/5 = 2/5
c) -5/6 - 23/6 = -28/6 = -14/3
d) -6/7 + 16/7 = 10/7
e) -21/5 + 2/5 = -19/5