先化简,在求值:(1/x+x²-2x+1/x²-1)÷x-1/x+1,其中x=2.请大家详细化简解,得:==(1/x+x²-2x+1/x²-1)*(x+1)/(x-1)==[1/x(1+x)]*[(x+1)/(x-1)]-[(2x+1)/(x-1)(x+1)]*[(x+...