2012.山西化简x^2-1/x^2-2x+1.x-1/x^2+x+2/x的结果是

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2012.山西化简x^2-1/x^2-2x+1.x-1/x^2+x+2/x的结果是
2012.山西化简x^2-1/x^2-2x+1.x-1/x^2+x+2/x的结果是

2012.山西化简x^2-1/x^2-2x+1.x-1/x^2+x+2/x的结果是
x^2-1/x^2-2x+1.x-1/x^2+x+2/x
=(x-1)(x+1)/(x-1)²*(x-1)/x(x+1)+2/x
=1/x+2/x
=3/x

2012.山西 化简x^2-1/x^2-2x+1.x-1/x^2+x+2/x的结果是