a= {1 2}
b={1 2 5}
c={4 6}
a) (a reunit b) intersectat c=
a reunit b={1 2 5}
paranteza intersectata cu c= {1 2 5} intersect {4 6} = multimea vida
b) a reunit (b intersectat c)
b intersectat c=multimea vida (nu au elemente comune)
a reunit cu multimea vida =
{1 2} reunit mult. vida = {1 2}
c) a minus (b intersect c)=
b intersect c=multimea vida
a- multimea vida = {1 2 } - multumea vida= {1 2}
