
(2x^4+x^3+2x^2+x)/(x^3+1)=2x+1+(2x^2-x-1)/(x^3+1)是怎么转化的
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(2x^4+x^3+2x^2+x)/(x^3+1)
=(2x^4+2x+x^3+1+2x^2-x-1)/(x^3+1)
=[2x(x^3+1)+(x^3+1)+(2x^2-x-1)]/(x^3+1)
=2x+1+(2x^2-x-1)/(x^3+1)
=(2x^4+2x+x^3+1+2x^2-x-1)/(x^3+1)
=[2x(x^3+1)+(x^3+1)+(2x^2-x-1)]/(x^3+1)
=2x+1+(2x^2-x-1)/(x^3+1)
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