Question

considere os intervalos reais A=[-1,4[ : B=[-2,3] ; C=]1,∞{ . determine
a)A∪B
b)A∩B
c)A∪C
d)C∩B

Answer 1

A∪B = [-2, 4[

A∩B = [-1, 3]

A∪C = [-1, ∞[

C∩B = ]1, 3]

;-)