Question

Determine A∪B e A∩B, quando:
a) A= {x ∈ lR/0 < x < 3} = ?
B= {x ∈ lR/1 < x < 5} = ?

b) A= {x ∈ lR/-7 ≤ x < 2}= ?
B= {x ∈ lR/0 ≤ x ≤ 5} = ?

Answer 1

a)
------------ 0 -------------- 3 -------------
-----------------1 ----------------- 5 ------

A U B = ]0, 5[
A n B = ]1, 3[

b)
---------------- -7---------------- 2 ---------------------
-------------------------0-------------------5-------------
A U B = [-7, 5]
A n b = [0, 2[