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1) f : R -> R si f(-3x+7)= -9x+14, calculati f(1) si apoi aflati f(x)
2) f : R -> R, f(x) = (2-[tex] \sqrt{5} [/tex])x +[tex] \sqrt{5} [/tex]
Determinati nr rationale a si b pt care f(a)=b+ b[tex] \sqrt{3} [/tex]