[1/(x+1)+(x^2-2x+1)/(x^2-1)]÷（x-1)/(x+1)=[1/(x+1)+(x-1)^2/(x+1)(x-1)]*(x+1)/(x-1)=[1/(x+1)+(x-1)/(x+1)]*(x+1)/(x-1)=[x/(x+1)]*(x+1)/(x-1)=x/(x-1)
题目出成式子，才好求啊！你这样出题实在看不大明白。
