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已知符号函数sgn(x)=,则函数f(x)=sgn(x)﹣2x的所有零点构成的集合为   .

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4      3      2      1  
sgn g x = sgn x    sgn g x = - sgn x    sgn g x = sgn f x    sgn g x = - sgn f x   
sgn[g(x)]=sgnx  sgn[g(x)]=﹣sgnx

  sgn[g(x)]=sgn[f(x)]  sgn[g(x)]=﹣sgn[f(x)]  

sgn[g(x)]=sgnx  sgn[g(x)]=﹣sgnx

  sgn[g(x)]=sgn[f(x)]  sgn[g(x)]=﹣sgn[f(x)]  

sgn[g(x)]=sgnx  sgn[g(x)]=﹣sgnx

  sgn[g(x)]=sgn[f(x)]  sgn[g(x)]=﹣sgn[f(x)]  

Sgn(Y-X)-Sgn(A-B)<0  Sgn(Y-X)-Sgn(A-B)=-2  Sg  Sgn  
sgn[g(x)]=sgnx  sgn[g(x)]=﹣sgnx

  sgn[g(x)]=sgn[f(x)]  sgn[g(x)]=﹣sgn[f(x)]  

sgn[g(x)]=sgnx  sgn[g(x)]=﹣sgnx  sgn[g(x)]=sgn[f(x)]  sgn[g(x)]=﹣sgn[f(x)]  

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