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Aflati functia liniara f:R->R, f(x)=ax+b stiind ca f(x+2)=2x+1.

Răspuns :

Notam cu t=x+2=> x=t-2=> 2x+1=2*(t-2)+1=> 2x+1=2t-3=> f(t)=2t-3=> 
f:R->R, f(x)=2x-3