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A \(y = x - 2\)      

B \(y =  - x - 2\)

C \(y =  - 2{\rm{x}} - 2\)            

D \(y = 2{\rm{x}} - 2\)

A \(m \le 1\)         

B \(m \le 0\)                     

C \(m < 1\)                      

D \(m < 0\)                      

A \(y =  - 2{\rm{x}} + 1\)           

B \(y = 2{\rm{x}} + 7\)

C \(y =  - 2{\rm{x}} - 5\)       

D \(y = 2{\rm{x}} + 2\)\(\)

A \(y = \left\{ {\begin{array}{*{20}{c}}{2x - 3{\rm{\,\,\,\, khi \,\,\,\,}}x \ge 1}\\{x - 2\,{\rm{\,\,\,\,khi \,\,\,\,}}x < 1}\end{array}} \right.\)

B \(y = \left\{ {\begin{array}{*{20}{c}}{x - 2{\rm{\,\,\,\, khi\,\,\,\, }}x \ge 1}\\{2x - 3{\rm{\,\,\,\, khi \,\,\,\,}}x < 1}\end{array}} \right.\)                                   

C \(y = \left\{ {\begin{array}{*{20}{c}}{3x - 4{\rm{\,\,\,\, khi\,\,\,\,}}x \ge 1}\\{ - x{\rm{\,\,\,\, khi\,\,\,\, }}x < 1}\end{array}} \right.\)             

D \(y = \left| {x - 2} \right|\)

A \(4030\)            

B \(4034\)                                 

C Vô số   

D \(2015\)           

A \(y = \left| x \right|\)     

B \(y = \left| x \right| + 1\)                      

C \(y = 1 - \left| x \right|\)            

D \(y = \left| x \right| - 1\)

A \(y = 2x - 1\)                

B \(y = \left| {2{\rm{x}} - 1} \right|\)

C \(y = 1 - 2x\)    

D \(y =  - \left| {2x - 1} \right|\)

A \(f\left( a \right) \le 4\)             

B \(f\left( a \right) \ge 4\)                        

C \(f\left( a \right) = 4\)   

D \(f\left( a \right) < 4\)