(1/x²-2x+1+(x²+2x+1/x²-1)÷(x²/x四次方-2x³+x²)
=【1/(x-1)²+(x+1)²/(x+1)(x-1)】÷1/(x-1)²
=1+(x+1)(x-1)
=1+x²-1
=x²
如果本题有什么不明白可以追问,