Știind ca A={-1,2,1/2,-4,5^2,-101,0} determinați mulțimile

Răspuns:
2. B=2,5^2,0
C=0,-4,-1,-101
3. -6;8;-2;0;-37,403
4. a). 0,4;8/4
b). 0,4,8/4,-5,-2
c). 1/3;0,(4)