Răspuns:
a) -3/8+2/8=-1/8
b)-7/9+(-2/9)=-9/9
c)+1/10+(-31/10)=-30/10
d) 1/2+(-3/4)= apolitic cu 2 fractia 1/2=2/4+(-3/4)=-1/4
e) -1/4+(-3/8)= amplifica cu 2 fractia -1/4=-2/8+(-3/4)=-5/8
