Question

a) A = [x ∈ R | 2 ≤ x ≤ 7},
B = [x ∈ R | 3 < x ≤ 8}

c) A = [x ∈ R | 2 ≤ x ≤ 7},
B = [x ∈ R | 3 < x ≤ 8}

b) A = [x ∈ R | x < 4},
B = [x ∈ R | x > 4}

d) A = [x ∈ R | 2 ≤ x ≤ 7},
B = [x ∈ R | 3 < x ≤ 8}

Answer 1

a)

AUB = {x ∈ R | 2 ≤ x ≤ 8}

A∩B={x ∈ R | 3 < x ≤ 7}

b)

AUB = R - {4}

A∩B= ∅

c) igual ao item a

AUB = {x ∈ R | 2 ≤ x ≤ 8}

A∩B={x ∈ R | 3 < x ≤ 7}

d)

igual ao item a

AUB = {x ∈ R | 2 ≤ x ≤ 8}

A∩B={x ∈ R | 3 < x ≤7}

c) igual ao item a

AUB = {x ∈ R | 2 ≤ x ≤ 8}

A∩B={x ∈ R | 3 < x ≤7}