∵x²-x=x(x-1)x²-1=(x+1)(x-1)x²+2x+1=(x+1)²∴最简公分母是x(x+1)²(x-1)∴x+1/x的平方-x=(x+1)/x(x-1)=(x+1)³/x(x+1)²(x-1)x/x的平方-1=x/(x+1)(x-1)=x²(x+1)/x(x+1)²...