Răspuns:
a) -1/7 + (-3/14) -(-1/2)=
-2/14 -3/14 + 7/14=
-5/14 + 7/14=
2/14= 1/7
d) 1/6 - (-1/4) + 5/12 -(+7/3)=
2/12 + 3/12 + 5/12 - 28/12 =
10/12 - 28/12=
-18/12 = - 9/6= - 3/2
