Question

Dados os intervalos
A=[5,7[ , B=]3,9[ , C=[ 0,11] .
CALCULE.
A) aUb.
B) aUc.
C)aUbUc.
D)A -B.
E)B-C

Answer 1

Temos o seguinte:

$A = (5,6) \\ B = (4,5,6,7,8) \\ C = (0,1,2,3,4,5,6,7,8,9,10,11)$

Logo:

$AUB = (4,5,6,7,8) \\ \\ AUC = (0,1,2,3,4,5,6,7,8,9,10,11) \\ \\ AUBUC = (0,1,2,3,4,5,6,7,8,9,10,11) \\ \\ A-B= \emptyset \\ \\ B-C = \emptyset$