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Fie f:R->R, f(x)=5x-2. Calculati f(-1)*f(1)*f(3)

Răspuns :

f(x)=5x-2.
f(-1)=-5-2=-7
f(1)=5-2=3
f(3)
=15-2=13
f(-1)*f(1)*f(3)=-7*3*13=-273