(x2-2x+1／x2-1)÷﹙1+(x-3／x+1)
=(x-1)(x-1)/(x+1)(x-1) ÷﹙2(x-1)／x+1)
=(x-1)/(x+1)× (x+1)/2(x-1)
=1/2我知道了谢谢选为满意答案 ↓