Question

Dado os conjuntos A = { x e R| -2 < x ≤ 4}, B= { x e R| -2≤ x ≤ 7} determine:
AUB
A∩B
A-B
B-A

Answer 1

A∪B = {x ∈ R | -2 ≤ x ≤ 7}

A∩B = {x ∈ R | -2 < x ≤ 4}

A - B = {∅}

B - A = {x ∈ R | x = -2, 7 ≥ x > 4}