Răspuns:
1
a) subunitara
b) rad2 rad3 si rad5 (rad fiind radical din)
c) Q
2.
N={0, 1, 2,3....}
Z={...-3,-2-,1,0,1,2,3...} ( multimea numerelor naturale si numerelor negative)
Q={0,2,-7, 1/3, 5/7, 0.66, 1.33(9)} (multimea Z + fractii)
R= orice numar care nu este irational
Nr irational (se noteaza cu I)
I=R/Q