Răspuns:
Explicație pas cu pas:
ex6
A={4,5,6,7}, B={4,5,6,7}, C={4,5,6,7}, D={3,4,5,6,7,8,9}, E={0,2,4}.
⇒A=B, A=C, B=C.
ex8
M={11,21,31,...,91}
a) card M = 9, deoarece multimea M are 9 elemente,
M={11,21,31,41,51,61,71,81,91}
b) {11,21,31,41}, {11,21,31.51}, {11,21,31,61}
c) {11,21,31,41,51,61,71,81}, {11,21,31,41,51,61,71,91}, {21,31,41,51,61,71,81,91},
{11,21,31,41,51,61,81,91}, {11,21,31,41,51,71,81,91}, {11,21,31,41,61,71,81,91},
{11,21,31,51,61,71,81,91}, {11,21,41,51,61,71,81,91}, {11,31,41,51,61,71,81,91}.
ex9
M={0,1,7}
a) ∅, {0}, {1}, {7}, {0,1}, {0,7}, {1,7}, {0,1,7}.
b) X={∅, {0}, {1}, {7}, {0,1}, {0,7}, {1,7}, {0,1,7}}.
c) card X = 8
