[12,92]\left[\frac{1}{2}, \frac{9}{2}\right][21,29]
(−∞,12]∪[92,∞)\left(-\infty, \frac{1}{2}\right] \cup\left[\frac{9}{2}, \infty\right)(−∞,21]∪[29,∞)
[−∞,12]\left[-\infty, \frac{1}{2}\right][−∞,21]
[12,92]∪[272,∞)\left[\frac{1}{2}, \frac{9}{2}\right] \cup\left[\frac{27}{2}, \infty\right)[21,29]∪[227,∞)