Với $x,y$ bất kỳ. Chọn khẳng định đúng?

$m < n$                   

$m = n$            

$m \le n$      

$m > n$

$a - b > 0$                   

$a - b < 0$            

$a - b = 0$      

$a - b \le 0$

$S = \left\{ x \in R|{x \ge \dfrac{1}{2}} \right\}$

$S = \left\{ x \in R|{x \ge  - \dfrac{1}{2}} \right\}$

$S = \left\{ x \in R|{x \le  - \dfrac{1}{2}} \right\}$

$S = \left\{ x \in R|{x \le \dfrac{1}{2}} \right\}$

$2a + 2 > 2b + 4$

$2a + 2 < 2b + 4$     

$2a + 2 \ge 2b + 4$

$2a + 2 \le 2b + 4$

(1);(3)                    

(2);(3)                        

Chỉ (3)                     

Chỉ (2)

$x > 4 - 2$

$x >  - 4 + 2$

$x >  - 4 - 2$

$x > 4 + 2$

$x < y$                   

$x = y$            

$x > y$          

$x \le y$