(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,...