x2减1分之x2减2x 除于（x-1减 x+1分之2x-1）化简_数学解答

x2减1分之x2减2x 除于（x-1减 x+1分之2x-1）化简

人气：249 ℃　时间：2020-01-28 10:02:13

解答

原式=[(x²-2x)/(x²-1)]÷[(x-1)-(2x-1)/(x+1)]= [(x²-2x)/(x²-1)]÷[(x²-2x)/(x-1)]= [(x²-2x)/(x²-1)]×[(x-1)/ (x²-2x)]=1/(x+1)