(x^3-x^2)/(x^2-x)-(1-X^2)/(X+1) =x^2/(x-1)/x(x-1)+(x^2-1)/(x+1)=x+(x+1)(x-1)/(x+1)=x+x-1=2x-1
1.化简(x^3-x^2)/(x^2-x)-(1-x^2)/(x+1)
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