若2x²+2x-1/2x+1=x+A/2x+1,则A为______若（2x²+2x-1）/（2x+1）=x+（A）/（2x+1）,则A为______A.x²+x-1B.x-1C.x²-x+1D.x+1

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若2x²+2x-1/2x+1=x+A/2x+1,则A为______若（2x²+2x-1）/（2x+1）=x+（A）/（2x+1）,则A为______A.x²+x-1B.x-1C.x²-x+1D.x+1

若2x²+2x-1/2x+1=x+A/2x+1,则A为______若（2x²+2x-1）/（2x+1）=x+（A）/（2x+1）,则A为______A.x²+x-1B.x-1C.x²-x+1D.x+1
若2x²+2x-1/2x+1=x+A/2x+1,则A为______
若（2x²+2x-1）/（2x+1）=x+（A）/（2x+1）,则A为______
A.x²+x-1
B.x-1
C.x²-x+1
D.x+1

若2x²+2x-1/2x+1=x+A/2x+1,则A为______若（2x²+2x-1）/（2x+1）=x+（A）/（2x+1）,则A为______A.x²+x-1B.x-1C.x²-x+1D.x+1
两边乘2x+1
2x²+2x-1=x(2x+1)+A
2x²+2x-1=2x²+x+A
A=x-1
选B