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X³−2X²+X−2
=X³+X−2X²−2·····並べ替え
=X(X²+1)−2(X²+1)·····前半をXで、後半を−2でくくる
=(X²+1)(X−2)·····(X²+1)でくくる

わかな

ありがとうございました!!

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