จำนวนจริง

x = {2, -1, 6}  

x = {2, -1, -6}  

x = {2, 1, 6} 

x = {-2, 1, 6} 

x = {3, 4, 5} 

x = {-3, 4, 5} 

x = {-5, 3, 4} 

x = {-4, 3, 5}  

x = { 3, 7 }

x = {-2, 3, 7}

x = {-3,-7, 2}

x = {3, 2}

$$\left(-\infty,5\right]\ \cup\ \left(1,\ \infty\right)$$

$$\left(-\infty,\ -5\right)\ \cup\ \left[1,\ \infty\right)$$

$$\left(-5,\ 1\right)$$

$$\left[-5,\ 1\right]$$

$$\left(-\infty,\ -3\right]\cup\left(2,\ 5\right]$$

$$\left(-\infty,\ -3\right]\cup\left(2,\ 5\right)$$

$$\left(-\infty,\ -3\right)\ \cup\left[2,\ 5\right]$$

$$\left(-\infty,\ -3\right)\ \cup\left(2,\ 5\right)$$

  $$\left[-1,\ 3\right]\ \cup\ \left(7,\infty\right)$$

$$\left[-1,\ 3\right]\ \cup\ \left[7,\infty\right)$$

$$\left(-1,\ 3\right)\ \cup\ \left[7,\infty\right)$$  

$$\left(-1,\ 3\right)\ \cup\ \left(7,\infty\right)$$  

  $$\left[-1,\ 3\right]\ \cup\ \left(5,\ \infty\right)$$

$$\left(-1,\ 3\right)\cup\ \left(5,\ \infty\right)$$  

$$\left(-1,\ 3\right]\ \cup\ \left(5,\ \infty\right)$$

$$\left[-1,\ 3\right]\ \cup\ \left[5,\ \infty\right)$$  

$$x\ =\ \left\{-3<\ x\ \le\ 1\ \ หรือ\ x\ \ge\ 8\right\}$$

$$x\ =\ \left\{x\ \le-3\ \ หรือ\ \ 1\ \le\ x\ \le\ 8\right\}$$

$$x\ =\ \left\{x\ <-3\ \ หรือ\ \ 1\ \le\ x\ \le\ 8\right\}$$

$$x\ =\ \left\{-3\le\ x\ \le\ 1\ \ หรือ\ x\ \ge\ 8\right\}$$

$$2<x\le5$$  

$$2\le x<5$$  

$$2\le x\le5$$  

$$2<x<5$$  

$$\left(-\infty,\ 1\right)\ \cup\ \left(3,\ 6\right]$$  

$$\left(-\infty,\ 1\right]\ \cup\ \left(3,\ 6\right]$$  

$$\left(-\infty,\ 1\right)\ \cup\ \left[3,\ 6\right]$$  

$$\left(-\infty,\ 1\right]\ \cup\ \left[3,\ 6\right]$$