(x²-2x+1分之x²-1+x+1分之1-x)÷x-1分之x
=(x-1)²分之(x+1)(x-1)+(x+1)分之(1-x)×x分之(x-1)
=(x-1)分之(x+1)+x(x+1)分之(1-x)(x-1)
=x(x+1)(x-1)分之(1-x)×x分之(x-1)
=x(x+1)(x-1)分之(5x²-2x+1)错了，(x-1)分之(x+1)没有乘以x分之(x-1)题目不清楚，只能这样理解啊再从算理解不清楚，算了