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Mianownik musi być różny od zera
x²-7x=0
x(x-7)=0
x=0 , x=7
Df: x∈R/{0,7}
to x≠0
jesli taki to
f(x)=1/(x²-7x)
mianownik musi być różny od zera
x²-7x=0
x(x-7)=0
x=0 , x=7
Df: x∈R/{0,7}