(1/x-1-1/x+1)÷(x/2x²-2)=((x+1)/(x²-1)-(x-1)/(x²-1))÷(x/(2(x²-1)))=(2/(x²-1))x(x(x²-1))=2x=2√2亲,请您点击【采纳答案】,您的采纳是我答题的动力,如果不明白,请追问,谢谢。