化简[(1/x -1)+(1/1-x^2)](1-1/x)

[(1/x -1)+(1/1-x^2)](1-1/x)
=[(1-x)/x+1/(1+x)(1-x)](x-1)/x
=-(x-1)^2/x^2-1/x(x+1)
=[-(x-1)^2(x+1)-x(x-1)]/x^2(x+1)
=-(x-1)(x^2-1+x)/x^2(x+1)

你可以来这里看看
http://www.nmline.com

x^3-x+1/x^3+x^2