х^3+27у^3+х^2-3ху+9у^2=(х+3у)(х^2-3ху+9у^2)+х^2-3ху+9у^2=(х^2-3ху+9у^2)(х+3у+1)
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х^3+27у^3+х^2-3ху+9у^2=(х+3у)(х^2-3ху+9у^2)+х^2-3ху+9у^2=(х^2-3ху+9у^2)(х+3у+1)
Второй вариант