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a fost răspuns

f:R --> R ; f (x)= -2x+1; f (1)+f (2)+f (3)=?

Răspuns :

Teodoraalbei
f(1)=-2·1+1=-2+1=-1
f(2)=-2·2+1=-4+1=-3
f(3)=-2·3+1=-6+1=-5
f(1)+f(2)+f(3)=-1-3-5=-9

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