计算：（1+1/x）·x²-2x+1/x²-1；
=（x+1）/x×(x-1)²/(x²-1)
=(x-1)/x;
（x²/x-1-2x/1-x）÷x/x-1.
=(x²+2x)/(x-1)×(x-1)/x;
=x+2;
如果本题有什么不明白可以追问,