Stabiliti valoarea de adevar a urmatoarelor proportii:
a) 1/3+4/3=5/3
b)2/7+1/7=1/7
c)7/11+2/11=9/22
d)2/3+8/3=7/3
e)9/2+4/2=13/4
f)5/3+1/3=2