化简(1-1/x)÷x2-2x+1/x2-1=(x-1)/x×(x²-1)/(x-1)²=(x+1)/x;=1+1/x;和（1/a+1+1/a-1）÷a/a+1+1=(a-1+a+1)/(a²-1)×(a+1)/a+1=2/(a-1)+1=(2+a-1)/(a-1)=(a+1)/(a-1);很高兴为您解答,skyhunter002为...