Ответ:
(х+1)(х^2-х+1)-х(х+3)(х-3)=х^3-х^2+х+х^2-х+1-х^3-9х^2=-9х^2+х+1=9х^2-х-1
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Ответ:
(х+1)(х^2-х+1)-х(х+3)(х-3)=х^3-х^2+х+х^2-х+1-х^3-9х^2=-9х^2+х+1=9х^2-х-1