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x(x²-4)≠0 ⇒ x≠0 ∧ x≠-2 ∧ x≠2
III /// to jest kreska ulamkowa ;d
3.
x²-4 /// x²-4x +4 = (x-2)(x+2) /// (x+2)² = x-2 /// x+2 D: x²+4x+4 ≠0 ⇒ (x+2)²≠0⇒ x≠-2
4. x²-64 /// x²-16x+64 = (x-8)(x+8) /// (x+8)² x-8 /// x+8 D: mianownik rozny od 0⇒ x+8≠0 ⇒ x≠-8
zjdalem 1
2x³ +8x /// x²-4 = 2x(x²+4) // (x-2)(x+2) D: x-2 ≠0 ∧ x+2≠0 ⇒ x≠2 ∧ x≠-2