Question

Se dau mulțimile:
A =(1, +inf);
B = (-V5, 3);
C = [-1, +inf).
Calculați: A∪B∪C; A∩B∩C

Answer 1

$A\cup B\cup C=(-\sqrt{5};+\infty) \\ \\ A\cap B\cap C=(1;3)$