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4x³-8x²-x+2≠0
4x²(x-2)-(x-2)≠0
(x-2)(4x²-1)≠0
(x-2)(2x-1)(2x+1)≠0
czyli
x-2≠0
x≠2
2x-1≠0
x≠1/2
2x+1≠0
x≠-1/2
dziedzina to R odjąć -1/2, 1/2 i 2