a) 4 intregi si 1/2 = (4*2+1)/2 = 9/2
V9/2 = V9/V2 = 3/V2
-V2 * (-3/V2) = 3
b) V8/V15 * V(6/5) = V8/V15 * V6/V5 = V8/V5 * V2/V5 = V16/5 = 4/5
