Răspuns:
a)1/2 + 1/3 + 1/6 =
(6+4+2)/12 = 1
b)1/12 - 1/4 + 1/3 =
(1-3+4)/12 = 2/12 = 1/6 = 6^(-1)
c)(3/2)^2 + 3/8 =
9/4 + 3/8 =
(18+3)/8 = 21/8
d)3/2 - 25 =
(3-50)/2 = (-47/2)
