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w(x)=(x-1)(x²+x+1)=x³+x²+x-x²-x-1=x³-1
w(x)=(x-8)(x²+8x+64)=x³-512
w(x)=(2x²-1)(4x ⁴ +2x²+1)=8x⁶-1
To są wzory x³-y³lub x³+y³