直接进行多项式除法就可以了.
f(x)=x³-3x²-x+1吧?
x/3-7/9
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3x²-2x+1√ x³-3x²-x+1
x³-2x²/3+x/3
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-7x²/3-4x/3+1
-7x²/3+14x/9-7/9
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-26x/9+16/9
商为 x/3-7/9,余式为-26x/9+16/9.