Va rog frumos!......

R/Q = I multimea numerelor iratioanale
V0,(8) = V(8/9) = 2V2/3 apartine I
V(2,25) = V(225/100) = 15/10 apartine Q
V(6 1/4) = V(25/4) = 5/2 apartine Q
V(3 1/9) = V(28/9) = V28/V9 = 2V7/3 apartine I
Deci A/(R/Q) = A / I = {-21/-7; V(2,25); V(6 1/4); -14/2; (-2)³}
card(A) = 5