(−∞,1)∪(1,+∞)(-\infty, 1) \cup(1,+\infty)(−∞,1)∪(1,+∞)
(−∞,0)∪(0,∞)(-\infty, 0) \cup(0, \infty)(−∞,0)∪(0,∞)
(−∞,−1](-\infty,-1](−∞,−1]
[1,±8)[1, \pm 8)[1,±8)