由分母则x-1≠0所以两边除以x-1x-1=2x=3错了,是-(x+1)原式=[x+x²-(x+1)²]/(x-1)*(x²-2x+1)/(x³+x²)=(-x-1)/(x-1)*(x-1)²/x²(x+1)=-(x+1)/(x-1)*(x-1)²/x²(x+1)=-(x-1)...【x-1分之x+x²-（x-1）】
x-1分之x+x²，然后-x-1.恩，采纳吧