a)
A∪B={1, 2, 3, 4}∪{3, 4, 5, 6}={1, 2, 3, 4, 5, 6}
(A∪B)\C={1, 2, 3, 4, 5, 6}\{2, 4, 6}={1, 3, 5}
A∪C={1, 2, 3, 4}∪{2, 4, 6}={1, 2, 3, 4, 6}
(A∪C)\B={1, 2, 3, 4, 6}\{3, 4, 5, 6}={1, 2}
A∩B={1, 2, 3, 4}∩{3, 4, 5, 6}={3, 4}
(A∩B)\C={3, 4}\{2, 4, 6}={3}
A∩C={1, 2, 3, 4}∩{2, 4, 6}={2, 4}
(A∩C)\B={2, 4}\{3, 4, 5, 6}={2}
b)
A∪B=⟨−4, 0⟩∪(−1, 3⟩=⟨−4, 3⟩
(A∪B)\C=⟨−4, 3⟩\⟨2, +∞)=⟨−4, 2)
A∪C=⟨−4, 0⟩∪⟨2, +∞)
(A∪C)\B=(⟨−4, 0⟩∪⟨2, +∞))\(−1, 3⟩=⟨−4, −1⟩∪(3, +∞)
A∩B=⟨−4, 0⟩∩(−1, 3⟩=(−1, 0⟩
(A∩B)\C=(−1, 0⟩\⟨2, +∞)=(−1, 0⟩
A∩C=⟨−4, 0⟩∩⟨2, +∞)=∅
(A∩C)\B=∅\(−1, 3⟩=∅