x的平方-2x+1分之x的3次方-x乘(1-x分之1)+x+1分之1其中x=根号2-1=x(x²-1)/(x-1)²×(1-1/x)+1/(x+1)=x(x+1)/(x-1)×(x-1)/x+1/(x+1)=x+1+1/(x+1)=√2-1+1+1/(√2-1+1)=√2+√2/2=3√2/2;很高兴为您解答,sky...