Resposta:
A={1,2,3,4,5}
B={7,6,5,4,3} ={3,4,5,6,7}
C= { }
a)AUB={1,2,3,4,5,6,7}
b) AUC ={1,2,3,4,5}
c) BUC ={7,6,5,4,3}
d) AUBUC ={1,2,3,4,5,6,7}
e) A∩ B∩C= { }
f) (AUB) ∩C = { }
g) A U (B∩C} = AU C={1,2,3,4,5}
h) (A∩B)UC = {3,4,5}
i) A-B ={1,2}
j) B-A ={6,7}
k) A-C = A
l) C-A = { }
