先化简,再求值：（1）（x+1/x²-x-x/x²-2x+1）÷1/x,x=根号2+1 急!=((x+1)/x(x-1)-x/(x-1)²)×x=(x+1)/(x-1)-x²/(x-1)²=(x²-1-x²)/(x-1)²=-1/(√2+1-1)²=-1/2;
