Tính \(\left( { - 909} \right) + 909.\)

$40$                         

$10$                            

$50$                          

$30$

$ - 70$                         

$70$                            

$60$                          

$ - 60$

$534$                         

$524$   

$ - 524$                          

$ - 534$

\( - 19082\)                         

\(18092\)                            

\( - 18092\)                          

\( - 18093\)

$x =  - 452$                         

$x =  - 254$                            

$x = 542$                          

$x = 254$

$678 + \left( { - 4} \right) < 678$                         

$4 + \left( { - 678} \right) >  - 678$                            

$678 + \left( { - 4} \right) = 678$                            

$4 + \left( { - 678} \right) =  - 674$