根据题意可知:2x^3-4x^2-1=A*2x+2x-1,解得A=x^2-2x-1
[2x^3-4x^2-1-(2x-1)]/2x=[2x^3-4x^2-2x]/2x=x^2-2x-1
x^2-2x-1
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