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Fie f:R-R
f(x)=x-3. Aflati f(-4)•f(-3)•...•f(n)•f(4)


Răspuns :

f(-4)•f(-3)•...•f(n)•f(4) = (-7)•(-6)•...•0•1=0
f(3)=0=>f(-4)xf(-3)x......xf(n)xf (4)=0