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f(x)=0 z def m zerowego
(1/2) x -3/2=0
(1/2)x = 3/2 /*2
x=3
3 nie nalezy do Df
brak m zerowych
b)
Df=R
f(x)=0
(x+2)(x-3)=0
x+2=0 v x-3=0
x= -2 v x= 3
m zerowe -2 oraz 3