Odpowiedź :
[tex]D:x^2-6x+9\not=0\\D:(x-3)^2\not=0\\D:x-3\not=0\\D:x\not=3\\\\x^3-9x=0\\x(x^2-9)=0\\x(x-3)(x+3)=0\\x=0 \vee x=3 \vee x=-3\\\\3\not\in D\\\\\boxed{x\in\{-3,0\}}[/tex]
[tex]D:x^2-6x+9\not=0\\D:(x-3)^2\not=0\\D:x-3\not=0\\D:x\not=3\\\\x^3-9x=0\\x(x^2-9)=0\\x(x-3)(x+3)=0\\x=0 \vee x=3 \vee x=-3\\\\3\not\in D\\\\\boxed{x\in\{-3,0\}}[/tex]