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Df = R \ { 1}
(3x -1 )/(x -1) = 0 <=> 3x -1 = 0 <=> x = 1/3
Miejsce zerowe: 1/3
x = 0
f(0) = (3*0 -1) /(0 -1) = -1/-1 = 1
A = (0 ; 1)
Wykres funkcji f przecina oś OY w punkcie A = (0; 1)