2001*(1/8-1/2009) 8*(1/2001-1/2009) 2009*(1/8-1/2001) =2001*(1-8/2009)*(2009/2001-1)*(1/8-1/2001) =2001*(2001/2009)*(1+8/2001-1)*(1/8-1/2001) =2001*(2001/2009)*1/2001*(1-8/2001) =(2001/2009)*(1993/2001) =1993/2009 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,