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->0, 4. Calculați f(1), f(-2), f(5), f(0,1), dacă: a) f: R→R, f(x)=2x-8; b) f: R→R, f(x) = 2, (3); c) f: R² →R', f(x) = 21, X d) f: R. →R., f(x)=√x.